Hardin

Historical marker location:

Hardin, Ohio

( Marker is at the intersection of Ohio Route 47 and Hardin-Wapakoneta Road on State Route 47.)

The Great Serpent Mound, located in Adams County, Ohio, is a prehistoric effigy mound in the shape of a serpent that is more than 1,300 feet long. It is one of the largest effigy mounds in the world and is estimated to have been built by the Adena culture more than 1,000 years ago.