The Great Serpent Mound in Adams County Ohio is the largest serpent effigy mound on Earth. It is more that 1,300 feet from tip to head. The Great Serpent is thought to be 1,000 years old. It is situated on a bluff above Ohio Brush Creek.

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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Serpent Mound in Adams County Ohio is the largest snake effigy on earth. It extends more than 1400 feet and the setting sun aligns with its head on the Summer Solstice.
On the days around the Summer Solstice hundreds of people gather at the site for that event.
In recent years Serpent Mound has become a focal point for new age spiritualism which puts many visitors at odds with the traditional owners and direct descendants of the builders of the mound.