Our Pick
Posted on @rawstates
Serpent Mound
300 BC
Adams County, Ohio
Stephanie A. Terry · CC BY-SA 4.0 · Wikimedia Commons
A quarter-mile earthen snake with a coiled tail, following a ridge above a crater made by an ancient meteor strike. It is the largest effigy mound in the world, its head aligned to the summer solstice sunset, and archaeologists still argue over whether the Adena or the Fort Ancient people built it.
That was 1 of the hidden places.
Location: documented spot
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