I can't remember too much about it, but the house we lived in when I was small up until I was about 13 was really spooky - apparantly there were numerous sightings of someone sitting at the top of the stairs. I don't remember seeing this, but i have always had a fear of sleeping in a room with an empty chair in case I wake up and someone is sitting in it, so I suspect that I had seen something when I was too young to make sense of it. When I was about 10 I used to come for lunch on my own, but there were days when I got to the house, touched the handle and knew that it just felt really bad, and I couldn't go in. My mum was really glad when we moved - I think that she had seen a few things that she didn't want to remember!
I also used to work in a building that was made up from a whole string of big terraced houses in a crescent - although joined together, each building retained its own character and one in particular felt really malevalent. We were relocating and the started to empty the building from that end and locked up each building connecting doors as it emptied. I worked in the next building to that one, and if I was working late, I could hear banging and shouting on the other side of the doors even though I knew the building was empty - that was always a good reason to leave for the night!
The security guard told me of one night hearing a baby crying in another of the buildings - he followed the source - thinking that maybe a window was open and it was coming from outside - he came into a room and could clearly hear the baby, then he a heard a woman singing from within the same room and the baby stopped - he said that when the singing started he felt really peaceful and safe.
That whole block has now been converted into very expensive flats - there are only a few that I feel I would want to live in though!