I've been to places like that, from time to time. One in particular is The Conneaut Lake Hotel, in Conneaut Lake, PA. The third floor is reputed to be haunted, and I'll tell you guys, straight up, it's creepy as hell, even in broad daylight. There's just this strange vibe to the place, that leaves you unsettled. The floors seem to be tilted to one side, in some areas, almost like a fun house. It could just be that they're warped, but the whole place throws off your equilibrium. People have reported seeing full bodied apparitions there, such as a lady in white, named Elizabeth, who died waiting for her fiance (or maybe husband) to come back from the war and now wanders the halls of the hotel eternally... They say that when she's near, you'll smell roses (or flowers of some kind, not really sure). There's another ghost, there, where you'll smell sulfur or rotten eggs, and this ghost is reported to be evil.
Like I said, I've walked those halls, during the day, and it is a creepy, creepy place, even in broad daylight.
There are other places I've been, like random basements, on my job as a telephone/circuit repairman, where I get this feeling, and I try to get out of there, as soon as possible. I know there's other places, I've been, like that, but I can't recall exactly where...
I'll see you at the NJ Gathering, Gregory, and everyone else that's attending.
Peace;)
Frank
P.S. Yes, H.P. Lovecraft is very, very creepy. There's a couple other authors, like that, but none quite so creepy as him.