1. Cahokia Mounds State Historic Site

In southern Illinois lies Cahokia Mounds, the largest pre-Columbian settlement north of Mexico. Once home to as many as 20,000 people, this ancient city flourished between 1050 and 1350 CE as the heart of the Mississippian culture. Cahokia’s massive earthen mounds rival the scale of ancient cities in Egypt and Mesopotamia. Recognized as a UNESCO World Heritage Site, it stands as a powerful reminder of Indigenous achievement and urban planning. Today, visitors can walk among the mounds and imagine the vibrant community that once thrived here.