Something that most people do not yet know is that there is a system of artificially built caves and tunnels across the Globe. Two recent examples of this, are the Caves in Huashan and Longyou, China. They are evidence of an ancient civilization that had technology on par or even superior to ours. In Huashan there are 36 artificially created caves and in Longyou 24 have been found so far...
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