Joliet's Oldest Remaining Construction

Historical marker location:

30 N Bluff Street, Joliet, Illinois

( Marker can be reached from North Bluff Street north of West Jefferson Street (U.S. 30).)

Illinois was part of the French colonial empire, and the city of Cahokia, located near present-day Collinsville, was one of the largest pre-Columbian cities in North America. At its peak, around 1250 CE, Cahokia had a population of around 20,000 people.