17 ancient tombs have been unearthed in Qilong Village, in China's Sichuan province. The ancient tombs include two timber-chambered tombs dating back to Western Han dynasty (206 BC-24 AD), nine brick tombs dating back to the Eastern Han dynasty (25AD-220AD) and six brick tombs dating back to the Song dynasty (960-1279). [Full
900-year-old drains built during the Song Dynasty have proven far more effective than modern sewer systems in dealing with heavy flooding in the Chinese city of Ganzhou. Two long tunnels, built using bricks from the city walls, cross the city and channel floodwater into two ponds that function as reservoirs.