Diamond Bluff Site-Mero Mound Group - Credit: Wikimedia Commons
Mero Mound Group or Diamond Bluff Site is an archeological site near Diamond Bluff, Wisconsin, in Pierce County, Wisconsin. It consists of at least two village sites surrounded by hundreds of mounds, including three effigy mounds. All were constructed from around 1000 AD to 1300 AD. Read more on Wikipedia
Source: en.wikipedia.org