Ancient Gavmishan Bridge locates in south west of Iran and belongs primarily to Sassanid era (224-651 AD); it was along an ancient road connecting Susa to Hegmataneh.
The bridge is one of ancient Persian engineering icons by having 175m length, 8.2m width, 6 arches and 50m arched span on the Seymareh river, which is the largest among historic bridges in Iran.
The main span was destroyed deliberately by Persian troops when retreating from Arabs’ invasion (650 AD); then reconstructed around 1600 AD and destroyed again by an earthquake in last century.

for viewing more pictures of this bridge, please visit:
http://www.pbase.com/k_amj/gavmishan