Cahokia Mounds — America's Lost Metropolis
📍 30 Ramey St, Collinsville, IL 62234
Around 1100 AD, this was one of the largest cities on Earth — bigger than London — built by the Mississippian culture across five square miles. Climb Monks Mound (a ten-story earthen pyramid), stand in Woodhenge's solar calendar, and let the interpretive center rearrange your American history. UNESCO-listed, minutes from St. Louis.

















