The Peking Man Site at Zhoukoudian is an important finding place of early Asian hominids. These include one of the first specimens of Homo erectus, dubbed Peking Man.Over 500.000 years ago, the caves in this limestone area were inhabited by early hominids. They stayed for the next 300.000 years. When this hominid race disappeared, the caves became naturally filled in, and the tools, food scraps and bones in them remained covered by deposits until modern times. The site was discovered in 1921