Scientists have identified 130 secret doors in the Great Wall of China. They examined the relic using high-resolution imaging, which allowed them to study details as small as 1 cm.
It turned out that the identified passages were well “embedded” in the local terrain, due to which they managed to make them secret. In ancient times they were used by scouts and merchants.
Historical documentation of the Ming Dynasty says that nomadic tribes were allowed to use the foraging gate between Qinghai and Hetao. At that time, this area in the northwestern part of China was famous for its water resources and green plants. Some gates were so large that two horses could pass through them at the same time.
In addition to the doors, they also revealed “false” walls, which were a passageway open from the side of the defenders and disguised with bricks from the side of the attackers. If necessary, the soldiers could destroy such a “shell” to carry out a surprise attack and protect the main gate. Mentions of these exits are found in documents that refer to several Chinese dynasties at once, but earlier scientists could not find evidence of their existence.
Earlier it was reported that in Beijing, scientists found “instructions” for the builders of the Great Wall of China. It is a 50-kilogram stone tablet with inscriptions.
