A team of researchers has found more than 130 secret doors inside the Great Wall of China, many of which are believed to have been used to send communications and carry out trade operations, Xinhua reported on Wednesday, according to Prensa Latina.
According to this medium, the structures were built to blend with the topology of the area and the discovery is the first physical evidence of their existence, as before that they were only mentioned in ancient writings.
The head of the expedition, Zhang Yucun, pointed out that official documents from the Ming Dynasty (1368-1644) tell of the movement of nomadic tribes and their livestock through hidden passages inside the Great Wall of China.
The discovery – referred to – shows that the wall is open in an orderly manner and can help complete its architectural mechanism.
Some doors were hidden behind many blocks, which prevented the enemies from entering, but allowed the Chinese soldiers to see them and attack them surprisingly from within.
The Great Wall of China is an ancient fortress built from the 5th century BC to protect the northern borders of the Chinese Empire from attacks. It is more than 20,000 km long and stretches from the border with the Democratic People’s Republic of Korea to the desert. from Gobi.
It was designated a World Heritage Site by UNESCO in 1987 and 20 years later it was chosen among the Seven Wonders of the Modern World.
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