 The President's Park, Lafayette Park, and nearby buildings are reported to be home to ghosts such as Philip Barton Key II and Stephen Decatur who died there following pistol duels.The Octagon is supposedly one of the most haunted buildings in D.C., with sightings of its past occupants and African American slaves who once worked there.The National Theatre is said to be haunted by the ghost of actor John McCullough, who was murdered in the 1880s by a fellow thespian.