Dujiangyan, Sichuan, China (12/28/2011)

The complex irrigation system of Dujiangyan was built over 2,000 years ago and is largely responsible for the fertility of Sichuan province.  It is impressive on both scale and complexity, and my lack of Chinese ability really prevented me from understanding more about how it actually worked, other than controlling silt content in water. Many beautiful temples were built alongside this ancient engineering project.