Heicheng--The largest and best preserved ancient city on Silk Road (1/4)

Tourists visit Heicheng in Ejina Banner of Alashan, north China's Inner Mongolia Autonomous Region, Sept. 28, 2012. The ancient city Heicheng which had been built in China's Western Xia Dynasty (1038-1227), is the largest and best preserved ancient city on the Silk Road that linked China with Central and Western Asia. (Xinhua/Yu Jia)