Bridges are physical support to cross an obstacle of your way. Bridges differ in their designs, the purpose they are built for and material used. The first bridge was made by Nature itself like stones in the river or fallen logs over a stream. The first bridge made by humans was wooden logs cut in different shapes and tied by leaves or ropes. The Arcadico Bridge of the 13th century BC in Greece is one of the oldest arch bridges. Bridges are used to cross a body of water, an unavoidable distance between two wall-type structures and mountains. Later on, there were many evolutions over the time. In the 1st to 2nd century AD Roman bridges were built. One of the famous bridges was in Spain at Alcantara build in 105 AD and it is still there as a milestone for the constructors of bridges.
Bridge
