2. Dongzhao ruins in Zhengzhou, Henan.Dongzhao ancient city ruins in Zhengzhou cover an area of 6,000 square meters. The ruins dated back to the Xia Dynasty, the first dynasty recorded in ancient China.

Interestingly, the relics of three ancient cities in different periods were in stacked on top of one another. A child's bones were also found within the wall of a city site. Archaeologists believe it is related to ancient sacrifice rites. [Photo/Xinhua]