A staff member of the Shahe Administration of Cultural Heritage shows antique coins dating back to ancient China's Tang Dynasty (618-907) in Shahe city, north China's Hebei province, Aug. 13, 2010. Archeologists recently unearthed about 17,000 antique coins of the Tang Dynasty from a construction site in Shahe. (Xinhua/Gong Zhihong)

A staff member of the Shahe Administration of Cultural Heritage shows antique coins dating back to ancient China's Tang Dynasty (618-907) in Shahe city, north China's Hebei province, Aug. 13, 2010. Archeologists recently unearthed about 17,000 antique coins of the Tang Dynasty from a construction site in Shahe. (Xinhua/Gong Zhihong)