The Great Serpent Mound, a pre-historic effigy mound, along Ohio Brush Creek in Ohio, USA

The Great Serpent Mound, a pre-historic effigy mound, along Ohio Brush Creek in Ohio, USA

Tom Till/Superstock ©

The Great Serpent Mound, a pre-historic effigy mound, along Ohio Brush Creek in Ohio, USA

The Great Serpent Mound, a pre-historic effigy mound, along Ohio Brush Creek in Ohio, USA

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