Over 2,000-year-old drainage system found in E China

Photo taken on Dec. 21, 2019 shows pottery pipes that compose a drainage system discovered at the Langyatai ruins in the city of Qingdao, east China's Shandong Province. A drainage system dating back to the Qin (221-206 BC) and Han (206 BC-220 AD) dynasties was discovered at the Langyatai ruins. Excavation started on two sites at the ruins in October this year. So far, an earth platform foundation, a drainage system, and a building base, which are on a grand scale and boast rigorous architectural crafts, have been discovered. (Xinhua/Li Ziheng)