A bridge is a structure built to span a physical obstacle without blocking the way underneath. It is constructed for the purpose of providing passage over the obstacle, which is usually something that is otherwise difficult or impossible to cross. There are many different designs of bridges, each serving a particular purpose and applicable to different situations. Designs of bridges vary depending on factors such as the function of the bridge, the nature of the terrain where the bridge is constructed and anchored, the material used to make it, and the funds available to build it.
A temporary wooden footbridge leading to Luang Prabang in Laos
The covered bridge in West Montrose, Ontario, Canada
The Albertus L. Meyers Bridge in Allentown, Pennsylvania, U.S., "one of the earliest surviving examples of monumental, reinforced concrete construction," according to the American Society of Civil Engineers.
Mohammed VI Bridge in Morocco
The Arkadiko Bridge or Kazarma Bridge is a Mycenaean bridge near the modern road from Tiryns to Epidauros in Argolis on the Peloponnese, Greece. The stone crossing, which is dated to the Greek Bronze Age, is one of the oldest arch bridges still in existence which is still crossable today. It is the oldest preserved bridge in Europe.
Arkadiko or Kazarma Bridge
The Mycenaean Bridge II (Petrogephyri bridge) about 1 km (0.62 mi) west of Arkadiko Bridge.
