Shushtar Historical Hydraulic System Archeologists as well as historians believed that Shushtar Historical Hydraulic System is a masterpiece of creative genius that the date back to Darius the Great in the 5th century B.C. As UNESCO site describe, the place is an architectural masterpiece. It involved the creation of two main diversion canals on the river Karun one of which, Gargar canal, is still in use providing water to the…