When I was a kid, there was an old house near the farm where I lived. It was abandoned, and had been for a long time. One day, a friend and I decided to investigate. We found a way in, and looked around the place. There was furniture there, and various stuff that belonged to whoever had lived there, but it was all dusty and kind of messed up.
We had this creepy feeling the entire time we were there, as if we were being watched, and it really creeped us out. After a little while, we got pretty scared and had to leave. As we left, we looked back at the house, and in the window on the top floor, we saw an old woman looking at us, watching us go. She looked angry.
I know what you are thinking, but nobody could have gotten into the place while we were in there. She hadn't been there before, and had to have been a ghost.
Commentary: This story is a personal account from an ex-girlfriend of mine. She grew up in a small town in rural Indiana, and like the kids from every town I know of, they had their local haunted house*. In this case it was a an abandoned, or assumed abandoned, farmhouse.
These locations are often the object of legend trippers, usually kids or adolescents, either looking for a thrill, to impress their peers, or on a dare. Typically these excursions are harmless, though they may result in property damage if the legend trippers are of a malicious bent. However, if the location is not as abandoned as it is thought, the legend trippers may find themselves running afoul of trespassing laws.
*In my home town, the local "haunted house" was actually a church that had fallen into disrepair. It was eventually restored and became a community fixture, which makes me wonder what the current "haunted house" in the neighborhood is. Maybe I should ask my nephews.
Sources: Personal Account