I went to see a house a few years ago and thought there had to be something seriously wrong with it because the price was really low for the area. I didn't investigate further because we found something better the next day.
A few days ago I drove by the house and saw it was for sale again. I just looked it up and it turns out there used to be another house on the land. It was a murder house that was torn down.
I have no issue with a murder house but I figure they should let you know.