The remains of the most sophisticated prehistoric native civilization north of Mexico are preserved at Cahokia Mounds State Historic ... theory about why the ancient city was abandoned.

It contained at least 120 mounds ... Cahokia, the best example of architecture is the "Monks Mound." It is 100 feet tall and named for the group of Trappist monks who lived near it during ancient ...

The Cahokia Mounds State Historic Site is one of the most studied Native American sites in the country. Recently, Saint Louis University professors, students and visiting scholars took a closer ...