Photo taken on Aug. 10, 2017 shows a blue and white porcelain discovered at Xinzheng Gate site in Kaifeng City, central China's Henan Province. Six ancient cities dating from the Warring States Period (475 B.C.- 221 B.C.) to the Qing Dynasty (1644-1911) were found deep underground in Kaifeng. The city launched a "City upon a City" Xinzheng Gate site project to carry out archaeological excavation here in 2012. (Xinhua/Zhu Xiang)
