This Sun Dial

Historical marker location:

1000 Carillon Blvd, Dayton, Ohio

( Marker can be reached from Carillon Boulevard, 0.2 miles west of South Patterson Boulevard, on the left when traveling west.)

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.