Illinois

By Travelog Editorial Team · Updated August 8, 2026

Illinois is live on Travelog with two destinations, roughly 260 miles apart. Cahokia Mounds, near Collinsville outside St. Louis, was inscribed by UNESCO in 1982 under criteria (iii) and (iv) as the largest pre-Columbian settlement north of Mexico. Chicago's Frederick C. Robie House is one of eight component buildings in Frank Lloyd Wright's 2019 UNESCO listing, The 20th-Century Architecture of Frank Lloyd Wright.

Illinois' two UNESCO stories sit roughly 260 miles apart and cover completely different eras, an 11th-century Mississippian city and a 20th-century architectural masterpiece, both covered honestly below.