85. HUASHAN MYSTERIOUS GROTTOES, CHINA
This artificial cave is 1,700 years old in estimation built in Huashan. However, the reason for making this is up until now a mystery. Nobody knew what this is for.
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85. HUASHAN MYSTERIOUS GROTTOES, CHINA
This artificial cave is 1,700 years old in estimation built in Huashan. However, the reason for making this is up until now a mystery. Nobody knew what this is for.