They were on a mission from God. There are few things that are more Illinois than The Blues Brothers whose movie has become a cult classic and many of the real Illinois filming locations are the same then as they are now as new photos and videos prove.
Normally hanging out at a prison would not be a good idea. In this case, it's highly recommended. There's an experience available where you can hang out in the same Joliet, Illinois prison that Jake and Elwood did in The Blues Brothers.
Almost everyone who's lived in Illinois for any period of time knows where the bridge is from the famous jump scene in The Blues Brothers movie. Did you know there's also what many consider to be the best seafood in Illinois (and maybe even the entire Midwest) located right next to it?