The Amsterdam Dungeon

You're standing on the Rokin, outside the Amsterdam Dungeon. First, take a look at the building itself. This is the Nieuwezijds Kapel, a real church. It closed as a church in 1970, and since September 2005 it's been home to a horror attraction. Here's the remarkable part: nothing of the church was demolished. All the sets can be taken out again, so one day the building could be a church once more. It even stands on real graves, though visitors never get to see them.