Dayton Daily News: See for yourself why Ohioโ€™s mysterious Serpent Mound is a must-visit place See for yourself why Ohioโ€™s mysterious Serpent Mound is a must-visit place Aerial views of the oldest surviving animal effigy mound in the world. Serpent Mound is the largest effigy mound in North America โ€” and one of only two effigy mounds in Ohio. It's worth the 90-minute ...

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