Atlas Obscura is one of the largest, most well-known and most impeccably awesome archives of amazing places, foods and experiences in the world.
Here is their list of places to see in the Prairie State, Illinois! From a fountain of feces, to a store fit for secret agents, to a gothic church spire atop a skyscraper, to a museum dedicated to the history of bondage and fetishism, Illinois is a wonderland of weird and wonderful sites! How many have you been to?
Note: Some of these you cannot visit or see anymore, which have been marked with (Permanently Closed). So therefore, if you haven't already seen them, I don't know if you'll ever be able to completely finish this list.
Note 2: This is as of November 6, 2023. Sorry future people, there will definitely be more that can't be added.