Real Haunted Houses in America

America is full of houses in which pain and suffering occurred and thus, some say, full of places that are haunted by the victims of that suffering. A look at some of the most famous "real" haunted houses would seem to give credence to that notion.

It's not clear whether ghosts choose to appear only to those who believe in them -- or not. But should you happen to visit one of these houses and run into a ghost, be sure to be polite.