The Longyou Caves are a series of large artificial sandstone caverns located at Phoenix Hill, near the village of Shiyan Beicun on the Qu River in Longyou County, Quzhou prefecture, Zhejiang province, China.
There is no written record of anyone building these caves, so it is believe to have been built before man created modern writing.
Academics claim the entire cave was dug by hand, but there are uniform cut marks along the cave walls that maintains a 60 degree angle of cut, which would indicate a machine was used.
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