Looking for some spine-tingling Halloween fun? While little ones have trick-or-treating and costume parties to look forward to, adults will want to discover some truly scary spots around town. Enjoy an evening searching high and low for the friendly ghosts of Chicago on a spooky tour guided by an expert historian or help to solve a murder mystery at the World Fair of 1893. Here are six spooky tours plus a murder mystery dinner you won't want to miss this Halloween in Chicago.