Paranormal things in Illinois

 https://www.amazon.com/Paranormal-Illinois-Michael-Kleen/dp/0764334301

https://www.coasttocoastam.com/article/illinois-woman-reports-seeing-weird-winged-creature-with-human-face-glowing-eyes/

https://us1049quadcities.com/iowa-and-illinois-most-spotted-monsters-are-ones-i-have-never-heard-of/

https://windycityghosts.com/most-haunted-places-in-illinois/

https://www.wapititravel.com/blog/en/haunted-places-in-illinois/

https://www.choosechicago.com/blog/tours-attractions/chicago-most-haunted-places/

Of course one of the Poltergeist movies was set Chicago. https://en.wikipedia.org/wiki/Poltergeist_III#Filming