Undated file photo shows the overall view of an ancient dam in Quxian County, southwest China's Sichuan Province. Six archaeological findings including the Quxian ancient dam were named as China's new discoveries in 2018 by the Chinese Academy of Social Sciences in Beijing, capital of China, Jan. 10, 2019. (Xinhua)

Combo photo shows construction components unearthed from an archaeological site of an ancient city built in the Jin Dynasty (1115-1234), at Taizicheng Village in Chongli District of Zhangjiakou City, north China's Hebei Province. Six archaeological findings including the Taizicheng site were named as China's new discoveries in 2018 by the Chinese Academy of Social Sciences in Beijing, capital of China, Jan. 10, 2019. (Xinhua)

Combo photo shows gold wares excavated from a tomb of the Eastern Zhou Dynasty (770-256 B.C.) at Liujiawa Village of Chengcheng County, northwest China's Shaanxi Province. Six archaeological findings including the Liujiawan ruins were named as China's new discoveries in 2018 by the Chinese Academy of Social Sciences in Beijing, capital of China, Jan. 10, 2019. (Xinhua)

File photo shows the view of the Qingtang ruins in Yingde City, south China's Guangdong Province. Six archaeological findings including the Qingtang ruins were named as China's new discoveries in 2018 by the Chinese Academy of Social Sciences in Beijing, capital of China, Jan. 10, 2019. (Xinhua)

File photo shows the view of the ruins built during the Neolithic age and the excavation site at Lushanmao Village of Yan'an City, northwest China's Shaanxi Province. Six archaeological findings including the Lushanmao site were named as China's new discoveries in 2018 by the Chinese Academy of Social Sciences in Beijing, capital of China, Jan. 10, 2019. (Xinhua)

File photo shows burial objects from a tomb dating back to the the Neolithic age at the Chenghe ruins in Shayang County, central China's Hubei Province. Six archaeological findings including the Chenghe ruins were named as China's new discoveries in 2018 by the Chinese Academy of Social Sciences in Beijing, capital of China, Jan. 10, 2019. (Xinhua)