How the cave's eerie acoustics have been associated with supernatural phenomena, earning it a reputation for connecting visitors to the spirit world.

The Tower of Skulls, a stone structure embedded with human skulls located in Serbia. It was constructed by the Ottoman Empire following the Battle of Cegar of May 1809, during the First Serbian Uprising.

This episode focuses the 'fairy coffins' - 17 miniature coffins containing carved figures, discovered in 1836 on Arthur's Seat, Edinburgh, with their exact purpose remaining a mystery. Plus, how the 1717 wreck of Black Sam Bellamy's pirate ship Whydah Gally yielded treasure, skeletons and new insights into the hidden world of piracy from its watery grave off Massachusetts.