Croton Dam Mound Group - Credit: Wikimedia Commons
The Croton Dam Mound Group, also known by the designations 20NE105, 20NE112, and 20NE116, is an archaeological site that was once a ceremonial site located on 2.3 acres near Croton, Michigan. It was listed on the National Register of Historic Places in 2009. Read more on Wikipedia
Source: en.wikipedia.org