Our Pick
Posted on @rawstates
Mammoth Cave and the guides who mapped it
1941
Edmonson County, Kentucky
Public domain · Wikimedia Commons
Over 400 mapped miles of passage, more than twice the next longest cave on earth, and surveyors keep finding more. Enslaved guides including Stephen Bishop explored and named much of it in the 1830s. Bishop crossed the Bottomless Pit on a cedar ladder.
That was 1 of the hidden places.
Location: historic site
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