Historical Marker
Indian Mill Stone
Historical marker location:
Port Clinton, Ohio
( Marker is at the intersection of East 2nd Street and Adams Street, on the right when traveling east on East 2nd Street.)
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.