“The mounds ... (include) a distinctive spiral mound, a restored Earth Lodge where tribal meetings ... least 17,000 years — ...

An aerial view shows Avery Lake and Kincaid Mounds, a settlement occupied during the Mississippian period (1150 to 1450 CE). The Southern Illinois settlement is near the Ohio River.

The mounds they built, which are currently a national historic site that includes a distinctive spiral mound, a restored Earth Lodge where tribal meetings occurred, and a labyrinth of walking ...

TIME has named Ocmulgee Mounds National Historical Park ... a reconstruction of the council chambers of the Mississippian culture, known as the Earth Lodge, and walking trails.