If you are more into real haunted house, rather than the ones with the fake blood and random people jumping out at you, then just head to Greeley and the campus of the University of Northern Colorado.
Education Dive ranked the UNC campus as the 7th most haunted campus in the country.
This is what they know about the paranormal residents;
At least one of the University of Northern Colorado's ghosts pulls double duty, haunting both the Wiebking and Wilson Hall dorms. The ghost, named Edith, was supposedly a bullied resident assistant who hung herself in the attic of one of the two buildings many years ago, and students now say they've experienced her changing channels on their TV or rearranging their furniture, in addition to hearing the sound of her playing with marbles. Other ghosts around campus include a Harrison Hall janitor killed by a brick dropped down a trash chute and a murder victim in the Tobey-Kindel dining hall, though, as is often the case in haunted campus tales, no historical records exist for any of these three deaths.
Another popular ghost, dubbed "Stoney," is likely just a not-so-clever excuse used by Turner Hall students when the smell of marijuana permeates the air.
The Greeley Tribune also did a story where they talked to people who have experienced the ghosts of UNC. See their stories here.