I lived in an old hospital turned into a frat house in college. I guarantee you that spirits/ghosts are very much alive and well in some places. I had too many experiences to count, hundreds. Funny thing about it all, I never had a scared feeling, just the opposite, almost a calm when i was alone in this 3 story house. They, the ghosts, used to play pranks on me and I know they thought it was funny to watch me. My keys would move off my desk and I'd have to look all over the damn place to find them right where I'd put them after looking forever for them. They'd knock my boooks off the desk and shit would go everywhere. I'd be studying and here someone walk to my door but not knock or open it, finally I'd get up expecting someone to be there and there wasn't.
You could hear people, what sounded like 15-20, down on the first floor and I'd go down expecting to see my frat buddies coming home, nobody would be there, and it was on an acre of property so it's not like they could get in the car and leave w/o being seen. Also, from time to time you could hear the cry of a baby, it had a maternity area. Many, many more. but as I say, I always though of them as "friendly" and they were. Sometimes when i would be studying for a big exam, they would feel like fucking with me, making noise, falling books, etc and I would get pissed as it was hard to concentrate and I'd yell, "hey, I have a test, CUT THAT SHIT OUT!" and they'd stop...
all that is the gosphal truth, I'd take a lie detector anyday....