Archaeologists from China uncovered the underground cities placed on top of each other. These cities were believed to come from different dynasties in Central China 2,000 years ago.

These ancient cities were discovered in Xinzheng Gate site in Kaifeng, Henan province. They were estimated to have been built during the period of Warring States in 475-221 BC until Qing dynasty in 1644-1911, according to People's Daily.

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One of the oldest cities in China is Kaifeng, and from the past dynasties, it was also considered as the Capital of China. The area is placed just south of the Yellow River. It was destroyed after various wars and buried underground due to floods coming from the river. Because of this, a new city eventually built on top of another city.

In 2006, the government of Kaifeng confirmed that there were six ancient cities buried underground, the site was also known as "City upon a City" project started in 2012. Now, the site is more than 2,000 square meters.

Among the six cities, the oldest is Daliang from the Warring States period. The city was buried about 12 meters below. Qing-dynasty, on the other hand, is just three meters below from Kaifeng.

These ancient cities were estimated to have been built 2 meters on above of each other. They also shared the same design and had a similar main street. The gates and traffic routes were also built exactly on top of one another.