Monks Mound

UNESCO World Heritage Site
Cahokia Mounds State Historic Site:
According to archaeological finds, the city of Cahokia was inhabited from about A.D. 700 to 1400. At its peak, from A.D. 1050 to 1200, the city covered nearly six square miles and possibly 10-20,000 people lived here. Over 120 mounds were built through time, and most mounds were enlarged several times.
www.cahokiamounds.com
Cahokia Mounds; Collinsville, I