Cahokia Mounds is a National Historic Landmark and a designated site for state protection. It is also one of the 24 UNESCO World Heritage Sites within the United States. The largest prehistoric earthen construction in the Americas north of Mexico, the site is open to the public and administered by the Illinois Historic Preservation Division and supported by the Cahokia Mounds Museum Society. In celebration of the 2018 Illinois state bicentennial, the Cahokia Mounds were selected as one of the Illinois 200 Great Places by the American Institute of Architects Illinois component (AIA Illinois) and was recognized by "USA Today Travel" magazine, as one of the selections for Illinois 25 Must See Places.