Serpent Mound, Ohio USA
The Great Serpent Mound is a 1,348-foot (411 m)-long, three-foot-high prehistoric effigy mound on a plateau of the Serpent Mound crater along Ohio Brush Creek in Adams County, Ohio. Serpent Mound is the largest serpent effigy in the world. It is thought to have been constructed by the Fort Ancient Culture around 1000 CE.
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