Here's a local legend in city not too far from me.
In this city was a very old mansion that was rumoured to be haunted. For years, no families stayed in it for more then a few years. Then about 40 years ago, a family moved in and converted it to a bed and breakfast. At first everything was fine and the business did well. Then the eldest son - (I believe he was late teens, or early 20s) complained of being tormented by a spirit, but no one took him seriously.
Then one day, the neighbours called the police as there was a weird smell coming from the property, and something was burning.
When the police arrived, they discovered that the young man had killed his whole family, and cut their body parts up into pieces, and was burning up the bodies in the firepit in the yard.
When questioned, he said the devil made him do it. - he is in a psychiatric ward and that is where he will spend the rest of his life.
Since then about 3 different families have lived in that house, and in each family, 1 member ended up in the psychiatric ward saying the devil was talking to them and trying to force them to do things.
The house was up for sale again last summer, and I thought I would have a look since it was vacant.
I drove up and felt like someone punched me in my gut. I doubled over in the car in pain. I turned the car around figuring I would need to go get help for myself, but when I got off the road, the pain went away and never returned.
I don't know what is going on at that property. It could have a logical explanation (such as tainted water, or other toxins that are causing the problems) or it could be real. I don't know. But i know this, I've not been back since, and have no intentions of ever going again.