The remains of the most sophisticated prehistoric native civilization north of Mexico are preserved at Cahokia Mounds State Historic Site. Within the 2,200-acre tract, located a few miles west of Collinsville, Illinois, lie the archaeological remnants of the central section of the ancient settlement that is today known as Cahokia. Cahokia Mounds has been recognized as a U. S. National Historic Landmark, and the United Nations Educational, Scientific, and Cultural Organization (UNESCO) , in 1982, designated Cahokia Mounds a World Heritage Site for its importance to our understanding of the prehistory of North America. Cahokia Mounds is managed by the Illinois Historic Preservation Agency.

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