A citadel is the most fortified area of a town or city. It may be a castle, fortress, or fortified center. The term is a diminutive of city, meaning "little city", because it is a smaller part of the
Reconstruction of the redoubt of Bibracte, a part of the Gaulish oppidum. The Celts utilized these fortified cities in the 2nd and 1st centuries BC.
Although much of Nice was ransacked during the 1543 siege of the city, Franco-Ottoman forces besieging Nice were unable to capture its Citadel. Citadels have often been used as a last defence for a besieged army.
The Royal 22nd Regiment's home garrison is the Citadelle of Quebec in Canada. The citadel is the largest still in military operation in North America.
Entrance to the armoured citadel of USS New Jersey
The Acropolis of Athens is an ancient citadel located on a rocky outcrop above the city of Athens, Greece, and contains the remains of several ancient buildings of great architectural and historical s
Citadel
…refuge, and a stronghold in peril, as well as containing military and food supplies, a shrine or temple, and a royal palace. The most well known is the Acropolis of Athens, but nearly every Greek city-state had one – the Acrocorinth is famed as a particularly strong fortress. In a much later period, when Greece was ruled…
The Acropolis of Athens in 2025
The Acropolis of Athens as seen from Mount Lycabettus. The wooded Hill of the Nymphs is half-visible on its right, and Philopappos Hill on the left, immediately behind. The Philopappos Monument is seen here where, in the distant background, the coast of Peloponnese meets the waters of the Saronic Gulf.
Primitive Acropolis with the Pelargicon and the Old Temple of Athena.
Elevation view of a proposed reconstruction of the Old Temple of Athena. Built around 525 BC, it stood between the Parthenon and the Erechtheum. Fragments of the sculptures in its pediments are in the Acropolis Museum.