In early January, a guest stayed in Room 812 at the Hotel Alex Johnson, in Rapid City, South Dakota. As the anonymous visitor wrote in the guest book the next morning, the night was a bit more than uneventful.

"The Hilton app does not warn you about ghosts when you select a room," the guest wrote. "A couple of co-workers told me I was nuts for staying there, but I don't believe in ghosts, so I figured that made me immune to them."

After a line space: "I could not have been more wrong."

Hotel Alex Johnson, a member of

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