Pictures taken on April 18, 2017 show a sandstone cave discovered at Shetang Village in Lanxi City, East China’s Zhejiang Province. The artificial cavern has a floor area of 3,000 square meters. The purpose of the cave is unknown, but they are not far from the mysterious Longyou Caves that have clear man-made origins but no historical record. (Photo/zjol.com.cn)
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