Grand Mound

Grand Mound - Credit: Wikimedia Commons

Grand Mound is a prehistoric burial site in Koochiching County, Minnesota, United States. It is the largest surviving prehistoric structure in the upper Midwest, dating back to 200 BCE. The site was listed as a National Historic Landmark on June 23, 2011. Read more on Wikipedia

type: NRHP
date from: None

Source: en.wikipedia.org