Stubbs Earthworks33 WA 1 - Credit: Wikimedia Commons
The Stubbs Earthworks (33 WA 1) (also known as Bigfoot Earthworks and Warren County Serpent Mound) was a massive Ohio Hopewell culture (100 BCE to 500 CE) archaeological site located in Morrow in Warren County, Ohio. Read more on Wikipedia
Source: en.wikipedia.org