Cahokia
The Cahokia Mounds State Historic Site is a historic site of a pre-Columbian city of the Native American Cahokia people. The park has 2,200 acres (900 ha) and 80 mounds made by the Cahokia people. The city was much larger than the area of the mounds. The city of Cahokia was one of the largest in the Mississippian culture. It existed from 1050 to 1350 CE. Cahokia Mounds is a National Historic Landmark and is a UNESCO World Heritage Site. It is one of 24 UNESCO sites in the United States.