The International Blue Stone

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Passed off as glacial erratics, bluestones were neither glacial, nor erratic. And they were only blue on special occasions.

Warren County Serpent Mound, Ohio, US

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Warren County serpent mound near Hamilton, Ohio, was apparently second only to the Great Serpent Mound in Adams County. Its controversies died when it was destroyed in the early 1970s.

Serpent Mound, Ohio, US

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LIDAR image of Ohio's Serpent Mound. Native Americans say they didn't build it. Academics say they did.