Discovering more than a hundred secret passages on the Great Wall of China: The great military wisdom of the ancients
The ruins of more than 130 secret doors on the Great Wall, one of the great wonders of the world, were recently revealed through high-resolution images by a research team. According to Xinhua, based on more thorough image analysis and field trips to the Great Wall, the team found that each secret door was designed to be compatible with each local’s topography. According to experts, these secret passage s are for scouts to pass through, while some are built as communication channels between the inside and outside of the Great Wall or for trade. trade in ancient times. According to some historical documents from the Ming Dynasty (1368-1644), nomadic tribes were allowed to use such secret gates to graze their livestock between Qinghai and Hetao, northwest China. China, an area with abundant water and grass at that time. Zhang Yukun, a professor from Tianjin University who also led the research team, said it was possible because some large secr...

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