It was built by a French immigrant for his English bride back in the 1800s, but now it's just ruins in the Illinois woods. See what remains of Hartford Castle originally known as Lakeview.
There is a former riverboat casino that is abandoned and still floating on the Illinois/Iowa border nearly adrift in the Mississippi River near Burlington.
He could have been a mass murderer, but his identity (and alleged crime) remains unproven still today. It's the story of an Illinois man who in the mid-1940s may have tried to gas his entire town.
There are several unsolved murder cases in Illinois dated back all the way to 1975, and many families still don't have any answers as to what has happened.