This file drone photo shows the ruins of the Tongyifang, a residential compound for high-ranking officials and dignitaries in the renowned Chang'an City during the Sui (581-618) and Tang (618-907) dynasties in Xi'an, northwest China's Shaanxi province. Archaeologists have uncovered 25 relic sites in Xi'an, the capital city of northwest China's Shaanxi province, with finds including ash pits and wells dating back to the Sui and Tang dynasties, the Shaanxi Academy of Archaeology announced on Thursday. [Photo/Shaanxi Academy of Archaeology handout via Xinhua]