Ghosts Of The RMS Queen Mary, Long Beach, CA

Aside from a brief stint as a war ship in World War II, the RMS Queen Mary served as a luxury ocean liner from 1936 to 1967. During that time, it was the site of at least one murder, a sailor being crushed to death by a door in the engine room, and children drowning in the pool.

 The city of Long Beach purchased the ship in 1967 and turned it into a hotel, and it still serves that purpose today—although the reported ghosts of the deceased passengers get to stay for free. (For an extra dose of spine-tingling experiences, try and visit the ship's engine room, considered by many to be a "hotbed" of paranormal activity.)