An archaeologist enters a tomb in Zhengxing Town of Chengdu, capital of southwest China's Sichuan Province, Jan. 18, 2018. More than 200 cave burial sites dating back to the Han Dynasty and Wei-Jin period (206 B.C.-420 A.D.) were found on high cliffs facing the Jinjiang River, which runs through the city. (Xinhua/Liu Kun)