Over the weekend, some friends and I visited David Byrne's awesome sound project, Playing the Building, down on South Street in lower Manhattan. He's basically rigged an old piano up to the pipes, furnaces, and grates of the Battery Maritime Building, so when you press the keys, it resonates all around you. The building itself is quite beautiful, grand but totally run-down, and the creepy sounds created reflect its ghost-like qualities. Read more about it/listen here, and if you're in the area, definitely go see it.
PS: David Byrne is awesome.