13-03-17: Archaeological treasure trove found in China

By Anya Palm

Although there is hardly any doubt that Chinese civilization has been highly developed from an early stage, the newest archaeological find is still remarkable:

Six ancient cities have been found in Henan Province, on top of each other, spanning almost 15 centuries from the Warring States to the Qing Dynasty.

http://www.scmp.com/news/china/society/article/2078340/six-ancient-underground-cities-one-top-other-unearthed-central