1.
Triumphal arch
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A triumphal arch is a monumental structure in the shape of an archway with one or more arched passageways, often designed to span a road. The main structure is decorated with carvings, sculpted reliefs. More elaborate triumphal arches may have multiple archways, Triumphal arches are one of the most influential and distinctive types of architecture associated with ancient Rome. The survival of great Roman triumphal arches such as the Arch of Titus inspired many states and rulers, up to the present day. Triumphal arch is also the given to the arch above the entrance to the chancel of a medieval church where a rood can be placed. The origins of the Roman triumphal arch are unclear, Triumphal arch look similar to Mesopotamian Arch entrances like the Ishtar Gate but there is no evidence to support that the Romans got their influence from there. The development of the arch is often associated with ancient Roman architecture. To fully understand this development however it is important to understand the importance of basic arches in Roman civilization, the Romans had learned how to construct effective arches from the Etruscans, who lived in central Italy. This knowledge had a impact on the architecture of Roman civilization. As a result, the Romans used arches for things such as aqueducts, amphitheaters, bridges and they had effectively used the arch in various aspects of their civilization and city structure. Since the Romans had effectively perfected this architectural structure, one could conclude that the arch symbolized perfection, monumental gateways had already been in use for hundreds of years by civilizations such as the Hittites, Assyrians, Babylonians and Myceneans. There were precursors to the arch within the Roman world, in Italy. Surviving examples of Etruscan arches can still be seen at Perugia, the two key elements of the triumphal arch – a round-topped arch and a square entablature – had long been in use as separate architectural elements in ancient Greece. Entablatures were a part of the structural fabric of such buildings. The great innovation of the Romans was to combine a round arch, the first recorded Roman triumphal arches were set up in the time of the Roman Republic. Generals who were granted a triumph were termed triumphators and would erect fornices or honorific arches bearing statues to commemorate their victories, a number of fornices were built in Rome during the Republican era. Lucius Steritinus erected two in 196 BC to commemorate his victories in Hispania, another fornix was built on the Capitoline Hill by Scipio Africanus in 190 BC, and Quintus Fabius Maximus Allobrogicus constructed one in the Roman Forum in 121 BC. None of them today and little is known about their appearance
2.
Byzantine Empire
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It survived the fragmentation and fall of the Western Roman Empire in the 5th century AD and continued to exist for an additional thousand years until it fell to the Ottoman Turks in 1453. During most of its existence, the empire was the most powerful economic, cultural, several signal events from the 4th to 6th centuries mark the period of transition during which the Roman Empires Greek East and Latin West divided. Constantine I reorganised the empire, made Constantinople the new capital, under Theodosius I, Christianity became the Empires official state religion and other religious practices were proscribed. Finally, under the reign of Heraclius, the Empires military, the borders of the Empire evolved significantly over its existence, as it went through several cycles of decline and recovery. During the reign of Maurice, the Empires eastern frontier was expanded, in a matter of years the Empire lost its richest provinces, Egypt and Syria, to the Arabs. This battle opened the way for the Turks to settle in Anatolia, the Empire recovered again during the Komnenian restoration, such that by the 12th century Constantinople was the largest and wealthiest European city. Despite the eventual recovery of Constantinople in 1261, the Byzantine Empire remained only one of several small states in the area for the final two centuries of its existence. Its remaining territories were annexed by the Ottomans over the 15th century. The Fall of Constantinople to the Ottoman Empire in 1453 finally ended the Byzantine Empire, the term comes from Byzantium, the name of the city of Constantinople before it became Constantines capital. This older name of the city would rarely be used from this point onward except in historical or poetic contexts. The publication in 1648 of the Byzantine du Louvre, and in 1680 of Du Canges Historia Byzantina further popularised the use of Byzantine among French authors, however, it was not until the mid-19th century that the term came into general use in the Western world. The Byzantine Empire was known to its inhabitants as the Roman Empire, the Empire of the Romans, Romania, the Roman Republic, Graikia, and also as Rhōmais. The inhabitants called themselves Romaioi and Graikoi, and even as late as the 19th century Greeks typically referred to modern Greek as Romaika and Graikika. The authority of the Byzantine emperor as the legitimate Roman emperor was challenged by the coronation of Charlemagne as Imperator Augustus by Pope Leo III in the year 800. No such distinction existed in the Islamic and Slavic worlds, where the Empire was more seen as the continuation of the Roman Empire. In the Islamic world, the Roman Empire was known primarily as Rûm, the Roman army succeeded in conquering many territories covering the entire Mediterranean region and coastal regions in southwestern Europe and north Africa. These territories were home to different cultural groups, both urban populations and rural populations. The West also suffered heavily from the instability of the 3rd century AD
3.
Turkey
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Turkey, officially the Republic of Turkey, is a transcontinental country in Eurasia, mainly in Anatolia in Western Asia, with a smaller portion on the Balkan peninsula in Southeast Europe. Turkey is a democratic, secular, unitary, parliamentary republic with a cultural heritage. The country is encircled by seas on three sides, the Aegean Sea is to the west, the Black Sea to the north, and the Mediterranean Sea to the south. The Bosphorus, the Sea of Marmara, and the Dardanelles, Ankara is the capital while Istanbul is the countrys largest city and main cultural and commercial centre. Approximately 70-80% of the countrys citizens identify themselves as ethnic Turks, other ethnic groups include legally recognised and unrecognised minorities. Kurds are the largest ethnic minority group, making up approximately 20% of the population, the area of Turkey has been inhabited since the Paleolithic by various ancient Anatolian civilisations, as well as Assyrians, Greeks, Thracians, Phrygians, Urartians and Armenians. After Alexander the Greats conquest, the area was Hellenized, a process continued under the Roman Empire. The Seljuk Sultanate of Rûm ruled Anatolia until the Mongol invasion in 1243, the empire reached the peak of its power in the 16th century, especially during the reign of Suleiman the Magnificent. During the war, the Ottoman government committed genocides against its Armenian, Assyrian, following the war, the conglomeration of territories and peoples that formerly comprised the Ottoman Empire was partitioned into several new states. Turkey is a member of the UN, an early member of NATO. Turkeys growing economy and diplomatic initiatives have led to its recognition as a regional power while her location has given it geopolitical, the name of Turkey is based on the ethnonym Türk. The first recorded use of the term Türk or Türük as an autonym is contained in the Old Turkic inscriptions of the Göktürks of Central Asia, the English name Turkey first appeared in the late 14th century and is derived from Medieval Latin Turchia. Similarly, the medieval Khazar Empire, a Turkic state on the shores of the Black. The medieval Arabs referred to the Mamluk Sultanate as al-Dawla al-Turkiyya, the Ottoman Empire was sometimes referred to as Turkey or the Turkish Empire among its European contemporaries. The Anatolian peninsula, comprising most of modern Turkey, is one of the oldest permanently settled regions in the world, various ancient Anatolian populations have lived in Anatolia, from at least the Neolithic period until the Hellenistic period. Many of these peoples spoke the Anatolian languages, a branch of the larger Indo-European language family, in fact, given the antiquity of the Indo-European Hittite and Luwian languages, some scholars have proposed Anatolia as the hypothetical centre from which the Indo-European languages radiated. The European part of Turkey, called Eastern Thrace, has also been inhabited since at least forty years ago. It is the largest and best-preserved Neolithic site found to date, the settlement of Troy started in the Neolithic Age and continued into the Iron Age
4.
Arch bridge
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An arch bridge is a bridge with abutments at each end shaped as a curved arch. Arch bridges work by transferring the weight of the bridge and its loads partially into a horizontal thrust restrained by the abutments at either side, a viaduct may be made from a series of arches, although other more economical structures are typically used today. Possibly the oldest existing bridge is the Mycenaean Arkadiko bridge in Greece from about 1300 BC. The stone corbel arch bridge is used by the local populace. The well-preserved Hellenistic Eleutherna Bridge has a corbel arch. The 4th century BC Rhodes Footbridge rests on an early voussoir arch, a more complete survey by the Italian scholar Vittorio Galliazzo found 931 Roman bridges, mostly of stone, in as many as 26 different countries. Roman arch bridges were usually semicircular, although a number were segmental arch bridges, generally, Roman bridges featured wedge-shaped primary arch stones of the same in size and shape. The Romans built both single spans and lengthy multiple arch aqueducts, such as the Pont du Gard and Segovia Aqueduct. Their bridges featured from an early time onwards flood openings in the piers, e. g. in the Pons Fabricius in Rome, Roman engineers were the first and until the industrial revolution the only ones to construct bridges with concrete, which they called Opus caementicium. The outside was covered with brick or ashlar, as in the Alcántara bridge. The Romans also introduced segmental arch bridges into bridge construction, trajans bridge over the Danube featured open-spandrel segmental arches made of wood. This was to be the longest arch bridge for a thousand years both in terms of overall and individual span length, while the longest extant Roman bridge is the 790 m long Puente Romano at Mérida. The late Roman Karamagara Bridge in Cappadocia may represent the earliest surviving bridge featuring a pointed arch, in medieval Europe, bridge builders improved on the Roman structures by using narrower piers, thinner arch barrels and lower span-rise ratios on bridges. Gothic pointed arches were introduced, reducing lateral thrust. The 14th century in particular saw bridge building reaching new heights, the bridge at Trezzo sullAdda, destroyed in the 15th century, even featured a span length of 72 m, not matched until 1796. Constructions such as the acclaimed Florentine segmental arch bridge Ponte Vecchio combined sound engineering with aesthetical appeal, the three elegant arches of the Renaissance Ponte Santa Trinita constitute the oldest elliptic arch bridge worldwide. In China, the oldest existing bridge is the Zhaozhou Bridge of 605 AD. The Zhaozhou Bridge, with a length of 167 feet and span of 123 feet, is the worlds first wholly stone open-spandrel segmental arch bridge, Bridges with perforated spandrels can be found worldwide, such as in China
5.
Limestone
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Limestone is a sedimentary rock, composed mainly of skeletal fragments of marine organisms such as coral, forams and molluscs. Its major materials are the minerals calcite and aragonite, which are different crystal forms of calcium carbonate, about 10% of sedimentary rocks are limestones. The solubility of limestone in water and weak acid solutions leads to karst landscapes, most cave systems are through limestone bedrock. The first geologist to distinguish limestone from dolomite was Belsazar Hacquet in 1778, like most other sedimentary rocks, most limestone is composed of grains. Most grains in limestone are skeletal fragments of organisms such as coral or foraminifera. Other carbonate grains comprising limestones are ooids, peloids, intraclasts and these organisms secrete shells made of aragonite or calcite, and leave these shells behind when they die. Limestone often contains variable amounts of silica in the form of chert or siliceous skeletal fragment, some limestones do not consist of grains at all, and are formed completely by the chemical precipitation of calcite or aragonite, i. e. travertine. Secondary calcite may be deposited by supersaturated meteoric waters and this produces speleothems, such as stalagmites and stalactites. Another form taken by calcite is oolitic limestone, which can be recognized by its granular appearance, the primary source of the calcite in limestone is most commonly marine organisms. Some of these organisms can construct mounds of rock known as reefs, below about 3,000 meters, water pressure and temperature conditions cause the dissolution of calcite to increase nonlinearly, so limestone typically does not form in deeper waters. Limestones may also form in lacustrine and evaporite depositional environments, calcite can be dissolved or precipitated by groundwater, depending on several factors, including the water temperature, pH, and dissolved ion concentrations. Calcite exhibits a characteristic called retrograde solubility, in which it becomes less soluble in water as the temperature increases. Impurities will cause limestones to exhibit different colors, especially with weathered surfaces, Limestone may be crystalline, clastic, granular, or massive, depending on the method of formation. Crystals of calcite, quartz, dolomite or barite may line small cavities in the rock, when conditions are right for precipitation, calcite forms mineral coatings that cement the existing rock grains together, or it can fill fractures. Travertine is a banded, compact variety of limestone formed along streams, particularly there are waterfalls. Calcium carbonate is deposited where evaporation of the leaves a solution supersaturated with the chemical constituents of calcite. Tufa, a porous or cellular variety of travertine, is found near waterfalls, coquina is a poorly consolidated limestone composed of pieces of coral or shells. During regional metamorphism that occurs during the building process, limestone recrystallizes into marble
6.
Anatolia
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Anatolia, in geography known as Asia Minor, Asian Turkey, Anatolian peninsula, or Anatolian plateau, is the westernmost protrusion of Asia, which makes up the majority of modern-day Turkey. The region is bounded by the Black Sea to the north, the Mediterranean Sea to the south, the Sea of Marmara forms a connection between the Black and Aegean Seas through the Bosphorus and Dardanelles straits and separates Anatolia from Thrace on the European mainland. Traditionally, Anatolia is considered to extend in the east to a line between the Gulf of Alexandretta and the Black Sea to the Armenian Highlands, thus, traditionally Anatolia is the territory that comprises approximately the western two-thirds of the Asian part of Turkey. The Turkification of Anatolia began under the Seljuk Empire in the late 11th century, however, various non-Turkic languages continue to be spoken by minorities in Anatolia today, including Kurdish, Assyrian, Armenian, Arabic, Laz, Georgian, and Greek. Traditionally, Anatolia is considered to extend in the east to a line running from the Gulf of Alexandretta to the Black Sea. This traditional geographical definition is used, for example, in the latest edition of Merriam-Websters Geographical Dictionary, under this definition, Anatolia is bounded to the east by the Armenian Highlands, and the Euphrates before that river bends to the southeast to enter Mesopotamia. To the southeast, it is bounded by the ranges that separate it from the Orontes valley in Syria, the first name the Greeks used for the Anatolian peninsula was Ἀσία, presumably after the name of the Assuwa league in western Anatolia. As the name of Asia came to be extended to areas east of the Mediterranean. The name Anatolia derives from the Greek ἀνατολή meaning “the East” or more literally “sunrise”, the precise reference of this term has varied over time, perhaps originally referring to the Aeolian, Ionian and Dorian colonies on the west coast of Asia Minor. In the Byzantine Empire, the Anatolic Theme was a theme covering the western, the modern Turkish form of Anatolia is Anadolu, which again derives from the Greek name Aνατολή. The Russian male name Anatoly and the French Anatole share the same linguistic origin, in English the name of Turkey for ancient Anatolia first appeared c. It is derived from the Medieval Latin Turchia, which was used by the Europeans to define the Seljuk controlled parts of Anatolia after the Battle of Manzikert. Human habitation in Anatolia dates back to the Paleolithic, neolithic Anatolia has been proposed as the homeland of the Indo-European language family, although linguists tend to favour a later origin in the steppes north of the Black Sea. However, it is clear that the Anatolian languages, the oldest branch of Indo-European, have spoken in Anatolia since at least the 19th century BC. The earliest historical records of Anatolia stem from the southeast of the region and are from the Mesopotamian-based Akkadian Empire during the reign of Sargon of Akkad in the 24th century BC, scholars generally believe the earliest indigenous populations of Anatolia were the Hattians and Hurrians. The region was famous for exporting raw materials, and areas of Hattian-, one of the numerous cuneiform records dated circa 20th century BC, found in Anatolia at the Assyrian colony of Kanesh, uses an advanced system of trading computations and credit lines. They were speakers of an Indo-European language, the Hittite language, originating from Nesa, they conquered Hattusa in the 18th century BC, imposing themselves over Hattian- and Hurrian-speaking populations. According to the most widely accepted Kurgan theory on the Proto-Indo-European homeland, however, the Hittites adopted the cuneiform script, invented in Mesopotamia
7.
Justinian I
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Justinian I, traditionally known as Justinian the Great and also Saint Justinian the Great in the Eastern Orthodox Church, was a Byzantine emperor from 527 to 565. During his reign, Justinian sought to revive the empires greatness, because of his restoration activities, Justinian has sometimes been called the last Roman in modern historiography. This ambition was expressed by the recovery of the territories of the defunct western Roman Empire. His general, Belisarius, swiftly conquered the Vandal kingdom in North Africa, the prefect Liberius reclaimed the south of the Iberian peninsula, establishing the province of Spania. These campaigns re-established Roman control over the western Mediterranean, increasing the Empires annual revenue by over a million solidi, during his reign Justinian also subdued the Tzani, a people on the east coast of the Black Sea that had never been under Roman rule before. A still more resonant aspect of his legacy was the rewriting of Roman law, the Corpus Juris Civilis. His reign also marked a blossoming of Byzantine culture, and his building program yielded such masterpieces as the church of Hagia Sophia, a devastating outbreak of bubonic plague in the early 540s marked the end of an age of splendour. Justinian was born in Tauresium around 482, a native speaker of Latin, he came from a peasant family believed to have been of Illyro-Roman or Thraco-Roman origins. The cognomen Iustinianus, which he later, is indicative of adoption by his uncle Justin. During his reign, he founded Justiniana Prima not far from his birthplace and his mother was Vigilantia, the sister of Justin. Justin, who was in the guard before he became emperor, adopted Justinian, brought him to Constantinople. As a result, Justinian was well educated in jurisprudence, theology, Justinian served for some time with the Excubitors but the details of his early career are unknown. Chronicler John Malalas, who lived during the reign of Justinian, tells of his appearance that he was short, fair skinned, curly haired, round faced, another contemporary chronicler, Procopius, compares Justinians appearance to that of tyrannical Emperor Domitian, although this is probably slander. When Emperor Anastasius died in 518, Justin was proclaimed the new emperor, during Justins reign, Justinian was the emperors close confidant. As Justin became senile near the end of his reign, Justinian became the de facto ruler, Justinian was appointed consul in 521 and later commander of the army of the east. Upon Justins death on 1 August 527, Justinian became the sole sovereign, as a ruler, Justinian showed great energy. He was known as the emperor who never sleeps on account of his work habits, nevertheless, he seems to have been amiable and easy to approach. Around 525, he married his mistress, Theodora, in Constantinople and she was by profession a courtesan and some twenty years his junior
8.
Pliny the Younger
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Gaius Plinius Caecilius Secundus, born Gaius Caecilius or Gaius Caecilius Cilo, better known as Pliny the Younger, was a lawyer, author, and magistrate of Ancient Rome. Plinys uncle, Pliny the Elder, helped raise and educate him, both Pliny the Elder and the Younger were witnesses to the eruption of Vesuvius in 79 AD, in which the former died. Pliny the Younger wrote hundreds of letters, of which 247 still survive and are of historical value. Some are addressed to reigning emperors or to such as the historian Tacitus. Pliny served as a magistrate under Trajan, and his letters to Trajan provide one of the few surviving records of the relationship between the imperial office and provincial governors. Pliny rose through a series of civil and military offices, the cursus honorum and he was a friend of the historian Tacitus and might have employed the biographer Suetonius on his staff. Pliny also came into contact with other men of the period, including the philosophers Artemidorus and Euphrates the Stoic. Pliny the Younger was born in Novum Comum around 61 AD, the son of Lucius Caecilius Cilo, born there, and his wife Plinia Marcella, a sister of Pliny the Elder. He was the grandson of Senator and landowner Gaius Caecilius, revered his uncle, Pliny the Elder, Cilo died at an early age, when Pliny was still young. As a result, the boy lived with his mother. His guardian and preceptor in charge of his education was Lucius Verginius Rufus, after being first tutored at home, Pliny went to Rome for further education. There he was taught rhetoric by Quintilian, a teacher and author. It was at time that Pliny became closer to his uncle Pliny the Elder. When Pliny the Younger was 17 or 18, his uncle Pliny the Elder died attempting to rescue victims of the Vesuvius eruption, in the same document the younger Pliny was adopted by his uncle. As a result, Pliny the Younger changed his name from Gaius Caecilius Cilo to Gaius Plinius Caecilius Secundus, there is some evidence that Pliny had a sibling. The trustees are apparently named in the inscription, L. Caecilius Valens and P. Caecilius Secundus, sons of Lucius, the word contubernalis describing Lutulla is the military term meaning tent-mate, which can only mean that she was living with Lucius, not as his wife. The first man mentioned, L. Caecilius Valens, is probably the older son, Pliny the Younger confirms that he was a trustee for the largess of my ancestors. It seems unknown to Pliny the Elder, so Valens mother was not his sister Plinia
9.
Trajan
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Trajan was Roman emperor from 98 to 117 AD. Born in the city of Italica in the province of Hispania Baetica, Trajans non-patrician family was of Italian, Trajan rose to prominence during the reign of emperor Domitian. Serving as a legatus legionis in Hispania Tarraconensis, in 89 Trajan supported Domitian against a revolt on the Rhine led by Antonius Saturninus, in September 96, Domitian was succeeded by Marcus Cocceius Nerva, an old and childless senator who proved to be unpopular with the army. After a brief and tumultuous year in power, culminating in a revolt by members of the Praetorian Guard, Nerva was compelled to adopt the more popular Trajan as his heir and he died on 27 January 98 and was succeeded by his adopted son without incident. Early in his reign, he annexed the Nabataean Kingdom, creating the province of Arabia Petraea and his conquest of Dacia enriched the empire greatly, as the new province possessed many valuable gold mines. However, its position north of the Danube made it susceptible to attack on three sides, and it was later abandoned by Emperor Aurelian. Trajans war against the Parthian Empire ended with the sack of the capital Ctesiphon and his campaigns expanded the Roman Empire to its greatest territorial extent. In late 117, while sailing back to Rome, Trajan fell ill and he was deified by the Senate and his ashes were laid to rest under Trajans Column. He was succeeded by his adopted son Hadrian, as an emperor, Trajans reputation has endured – he is one of the few rulers whose reputation has survived nineteen centuries. Every new emperor after him was honoured by the Senate with the wish felicior Augusto, among medieval Christian theologians, Trajan was considered a virtuous pagan. As far as ancient literary sources are concerned, an extant continuous account of Trajans reign does not exist, only fragments remain of the Getiká, a book by Trajans personal physician Titos Statilios Kriton. The Parthiká, a 17-volume account of the Parthian Wars written by Arrian, has met a similar fate, book 68 in Cassius Dios Roman History, which survives mostly as Byzantine abridgments and epitomes, is the main source for the political history of Trajans rule. Besides this, Pliny the Youngers Panegyricus and Dio of Prusas orations are the best surviving contemporary sources and it is certain that much of text of the letters that appear in this collection over Trajans signature was written and/or edited by Trajans Imperial secretary, his ab epistulis. Therefore, discussion of Trajan and his rule in modern historiography cannot avoid speculation, as well as recourse to sources such as archaeology. Marcus Ulpius Traianus was born on 18 September 53 AD in the Roman province of Hispania Baetica, Trajans birthplace of Italica was founded as a Roman military colony in 206 BC, though it is unknown when the Ulpii arrived there. Trajan was the son of Marcia, a Roman noblewoman and sister-in-law of the second Flavian Emperor Titus, and Marcus Ulpius Traianus, Marcus Ulpius Traianus the elder served Vespasian in the First Jewish-Roman War, commanding the Legio X Fretensis. Trajan himself was just one of many well-known Ulpii in a line that continued long after his own death and his elder sister was Ulpia Marciana, and his niece was Salonina Matidia. The patria of the Ulpii was Italica, in Spanish Baetica, as a young man, he rose through the ranks of the Roman army, serving in some of the most contested parts of the Empires frontier
10.
Canal
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Canals and navigations are human-made channels for water conveyance, or to service water transport vehicles. In the vernacular, both are referred to as canals, and in most cases, the works will have a series of dams. These areas are referred to as water levels, often just called levels. In contrast, a canal cuts across a drainage divide atop a ridge, many canals have been built at elevations towering over valleys and others water ways crossing far below. Cities need a lot of water and many canals with sources of water at a higher level can deliver water to a destination where there is a lack of water. The Roman Empires Aqueducts were such water supply canals, a navigation is a series of channels that run roughly parallel to the valley and stream bed of an unimproved river. A navigation always shares the drainage basin of the river, a vessel uses the calm parts of the river itself as well as improvements, traversing the same changes in height. A true canal is a channel that cuts across a drainage divide, most commercially important canals of the first half of the 19th century were a little of each, using rivers in long stretches, and divide crossing canals in others. This is true for many canals still in use, there are two broad types of canal, Waterways, canals and navigations used for carrying vessels transporting goods and people. These can be subdivided into two kinds, Those connecting existing lakes, rivers, other canals or seas and oceans and those connected in a city network, such as the Canal Grande and others of Venice Italy, the gracht of Amsterdam, and the waterways of Bangkok. Aqueducts, water canals that are used for the conveyance and delivery of potable water for human consumption, municipal uses, hydro power canals. Historically canals were of importance to commerce and the development, growth. In 1855 the Lehigh Canal carried over 1.2 million tons of burning anthracite coal, by the 1930s the company which built. By the early 1880s, canals which had little ability to compete with rail transport, were off the map. In the next couple of decades, coal was diminished as the heating fuel of choice by oil. Later, after World War I when motor-trucks came into their own, Canals are built in one of three ways, or a combination of the three, depending on available water and available path, Human made streams A canal can be created where no stream presently exists. Either the body of the canal is dug or the sides of the canal are created by making dykes or levees by piling dirt, stone, the water for the canal must be provided from an external source, like streams or reservoirs. Where the new waterway must change elevation engineering works like locks, lifts or elevators are constructed to raise, examples include canals that connect valleys over a higher body of land, like Canal du Midi, Canal de Briare and the Panama Canal
11.
Bosphorus
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The Bosphorus or Bosporus is a narrow, natural strait and an internationally significant waterway located in northwestern Turkey. It forms part of the boundary between Europe and Asia, and separates Asian Turkey from European Turkey. The worlds narrowest strait used for navigation, the Bosphorus connects the Black Sea with the Sea of Marmara, and, by extension via the Dardanelles. Most of the shores of the strait are heavily settled, straddled by the city of Istanbuls metropolitan population of 17 million inhabitants extending inland from both coasts, together with the Dardanelles, the Bosphorus forms the Turkish Straits. This folk etymology was canonized by Aeschylus in Prometheus Bound, where Prometheus prophesies to Io that the strait would be named after her, the site where Io supposedly went ashore was near Chrysopolis, and was named Bous the Cow. The same site was known as Damalis, as it was where the Athenian general Chares had erected a monument to his wife Damalis. Historically, the Bosphorus was also known as the Strait of Constantinople, or the Thracian Bosphorus and these are expressed in Herodotus Histories,4.83, as Bosporus Thracius, Bosporus Thraciae, and Βόσπορος Θρᾴκιος, respectively. Other names by which the strait is referenced by Herodotus include Chalcedonian Bosporus, the term eventually came to be used as common noun βόσπορος, meaning a strait, and was also formerly applied to the Hellespont in Classical Greek by Aeschylus and Sophocles. Presently, the waterway is officially referred to as simply Bosphorus, the Marmara further connects to the Aegean and Mediterranean Seas via the Dardanelles. A common mistake made by those who are unfamiliar with the locale is to assume the Bosphorus is a river, when it is, in fact. The exact scientific cause and date of the formation of the Bosphorus remain the subject of debate among geologists, many geologists, however, claim that the strait is much older, even if relatively young on a geologic timescale. The Symplegades were defeated when the lyrical hero Jason obtained successful passage, whereupon the rocks became fixed, between these limits, the strait is 31 km long, with a width of 3,329 m at the northern entrance and 2,826 m at the southern entrance. Its maximum width is 3,420 m between Umuryeri and Büyükdere Limanı, and minimum width 700 m between Kandilli Point and Aşiyan, the depth of the Bosphorus varies from 13 to 110 m in midstream with an average of 65 m. The deepest location is between Kandilli and Bebek with 110 m, the most shallow locations are off Kadıköy İnciburnu on the northward route with 18 m and off Aşiyan Point on the southward route with 13 m. The study of the water and wind erosion of the straits relates to that of its formation, sections of the shore have been reinforced with concrete or rubble and sections of the strait prone to deposition are periodically dredged. These channels are the main pathway for sediments to the deep sea where they form sedimentary deposits. These deposits ultimately hold not only untapped reserves of gas and oil and our initial findings show that the flow in these channels is quite different to the flow in river channels on land. Specifically, as flow moves around a bend it spirals in the direction in the deep sea compared to the spiral found in river channels on land
12.
Roman roads
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They provided efficient means for the overland movement of armies, officials, and civilians, and the inland carriage of official communications and trade goods. Roman roads were of several kinds, ranging from local roads to broad, long-distance highways built to connect cities, major towns. These major roads were often stone-paved and metaled, cambered for drainage and they were laid along accurately surveyed courses, and some were cut through hills, or conducted over rivers and ravines on bridgework. Sections could be supported over marshy ground on rafted or piled foundations, at the peak of Romes development, no fewer than 29 great military highways radiated from the capital, and the late Empires 113 provinces were interconnected by 372 great roads. The whole comprised more than 400,000 kilometres of roads, in Gaul alone, no less than 21,000 kilometres of roadways are said to have been improved, and in Britain at least 4,000 kilometres. The courses of many Roman roads survived for millennia, some are overlaid by modern roads, livy mentions some of the most familiar roads near Rome, and the milestones on them, at times long before the first paved road—the Appian Way. Unless these allusions are just simple anachronisms, the referred to were probably at the time little more than levelled earthen tracks. Thus, the Via Gabina is mentioned in about 500 BC, the Via Latina in about 490 BC, the Via Nomentana, in 449 BC, the Via Labicana in 421 BC, and the Via Salaria in 361 BC. There is hardly a district to which we expect a Roman official to be sent, on service either civil or military. They reach the Wall in Britain, run along the Rhine, the Danube, and the Euphrates, and cover, as with a network, a road map of the empire reveals that it was generally laced with a dense network of prepared viae. Beyond its borders there were no paved roads, however, it can be supposed that footpaths, there were, for instance, some pre-Roman ancient trackways in Britain, such as the Ridgeway and the Icknield Way. For specific roads, see Roman road locations below, the Laws of the Twelve Tables, dated to about 450 BC, specified that a road shall be 8 Roman feet wide where straight and twice that width where curved. Actual practices varied from this standard, the Tables command Romans to build roads and give wayfarers the right to pass over private land where the road is in disrepair. Roman law defined the right to use a road as a servitus, the ius eundi established a claim to use an iter, or footpath, across private land, the ius agendi, an actus, or carriage track. A via combined both types of servitutes, provided it was of the width, which was determined by an arbiter. The default width was the latitudo legitima of 8 feet, Roman law and tradition forbade the use of vehicles in urban areas, except in certain cases. Married women and government officials on business could ride, the Lex Iulia Municipalis restricted commercial carts to night-time access in the city within the walls and within a mile outside the walls. Such roads led either to the sea, or to a town, or to a public river and these roads bear the names of their constructors
Media related to Sangarius Bridge at Wikimedia Commons
