The Collection
ancient mystery
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The Mystery of the Longyou Caves in China
The Longyou Caves were discovered in 1992 by local villagers who initially thought they were exploring a “bottomless pond.” To their astonishment,…
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Mysterious Ancient Doorway at Hejin City
Situated atop a lofty loess slope, this mysterious fortress is cleverly concealed by deep gorges, rendering it almost invisible to the untrained…