TIL about the Black Coffey Caverns. A series of caves in Pennsylvania that can only be accessed through a basement. uncoveringpa.com Submitted by acrylicrainbow t3_10n5loe on January 28, 2023 at 4:03 AM in todayilearned 10 comments 223
jfpbookworm t1_j670v1e wrote on January 28, 2023 at 4:05 AM I thought that was the Great Underground Empire. Permalink 3
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