Adena Prehistoric Earthwork in Piqua, Ohio

Was on left bank of Great Miami River, 2.5 miles above Piqua, upon the farm of Col. John Johnston.  prehistoric earthworks in the area, including 11 circular enclosures, three square enclosures and an 18-acre stone wall enclosure. Traces of this last structure can be seen when driving along Ohio Route 66 in Piqua. This is best described as a henge. For examoples and definition of a "henge" see this post  www.nephilimgiants.net : What is a Solar Temple, Called a Henge?