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Mysterious Pyramids In Ohio? Inside Hopewell Culture And Serpent MoundSerpent Mound was built on a site where a meteor hit the earth about 300 million years ago. As for the shape of the mound, it ...
The Serpent Mound Historical Site ... Fort Ancient Earthworks, just outside Lebanon, is North America's largest ancient hilltop enclosure, believed to be constructed over 2,000 years ago.
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