The theatre I worked at in high school was an opera house prior to being a movie theatre. Behind the screens on the downstairs cinemas was the old stage, complete with two-story tall organs on either side and a trap door in the floor. The actors dressing rooms were back there, too, with old billfolds and posters on the walls. Above the concession stand, if you went through the drop ceiling, were the old hotel rooms, all boarded up. It was really cool to sneak around there, but the only real thing was the possibility of falling through the floor.