This episode is all about the reportedly haunted Wood County Insane Asylum in Marshfield, Wisconsin.

Sources:

https://www.marshfieldscrap.com/history.html

https://www.asylumprojects.org/index.php/Wood_County_Asylum

https://www.onlyinyourstate.com/wisconsin/wi-small-town-paranormal-activity/

https://sites.rootsweb.com/~wiwood/history/Towns/Marshfield/asylum.htm