Hacker House, in North Carolina, is said to be built on a Native American mass grave

If ghosts exist, surely it's on Friday the 13th - today's date, and the most superstitious day of the year - that they feel most secure. But if these supernatural entities do exist, what are they? Are they souls of the deceased trapped in purgatory, or a psychic imprint made from an extreme past event replaying like a hologram stuck on repeat?

Intrepid ghost-hunters hope to mop up ectoplasm and battle evil apparitions as they creep around unnaturally cold spots in the dead of night. On this most appropriate of days, join them on our tour of the world's (reputedly) most haunted and scary locations. Just make sure you bring a spare pair of pants.