Possibly even snakes, although the famed Serpent Mound ... A series of Hopewell mounds in Ohio has been declared a UNESCO ...

The great Serpent Mound of Ohio, which has long been a subject of study and research for American archaeologists, has been given by the Corporation to the Ohio State Archaeological and Historical ...

The Serpent Mound Historical Site, located in Peebles, Ohio, is the world's largest effigy ... home to the largest group of Hopewell burial mounds in eastern North America, with an estimated ...