All aboard … if you dare! Often said to be the most haunted place in the world, the cruiseliner Queen Mary, docked off Long Beach, CA, is one of the scariest — and most festive! — places to celebrate Halloween. The experience at Dark Harbor is unique and quite unpredictable: Visitors venture through 6 terrifying mazes haunted by more than 200 monsters and ghosts, many of which are inspired by the actual spirits that haunt the ship. The experience runs throughout the month of October, and includes live entertainment, food and beverages.