Shushtar, Historical Hydraulic System in Iran
The system that provides water for the western Iranian city of Shushtar is a marvel of engineering dating back to the 5th century B.C., built under the direction of Darius the Great. With two main canals, rushing waterfalls and a mill, the rock complex that serves as the system's operation center is an ancient destination--and what UNESCO referred to as "a masterpiece of creative genius"--brought to new attention with its 2009 addition to the list.
