History, Museums, Bike Trails and Spectacular Sites are all along the Great River Road in Illinois.
I posted a photo of Fort de Chartres, one of the few French forts that still exist in the U.S., originally built in 1720, and located on the east side of the Mississippi River. You are free to walk around the wood and stone fort. Authentic reenactments, rich history, and great for kids.
Prairie du Rocher, IL