Illinois - Cahokia Mounds State Historic Site

Cahokia Mounds State Historic Site and Interpretive Center
Collinsville, Illinois

Panorama, Life-size Neighborhood Diorama; depicting a Cahokia neighborhood, showing a variety of house styles, people, and activities
2010

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Cahokia Mounds State Historic Site is the area of an ancient indigenous city (ca 600–1400 CE) near Collinsville, Illinois. The 2,200-acre (8.9 km2) site included 120 man-made earthwork mounds over an area of six square miles, although only 80 survive.

Cahokia Mounds is the largest archaeological site related to the Mississippian culture, which developed advanced societies in central and eastern North America beginning more than five centuries before the arrival of Europeans.

It was designated a National Historic Landmark on July 19, 1964, and listed on the National Register of Historic Places on October 15, 1966. In 1982 UNESCO designated Cahokia Mounds State Historic Site a World Heritage Site.