Germantown, Ohio Serpentine Earthen Enclosure
The serpentine gateway at Spruce Hill was duplicated at several hilltop ceremonial centers, including the work at Germantown, Ohio. Built by the Adena Hopewell. See the amazing discovery of a Serpent Mound swallowing an egg in Chicago, Illinois www.nephilimgiants.net : Serpent Mound Discovered Within Chicago's City Limits
Serpentine gateway of the Germantown hilltop earthwork is very similar to the Spruce Hill gateway. The approaches to this earthwork looked to be man made and undulated like a serpent.
Parts of the original wall that skirts the bluff are still visible in the winter months.