17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This South London cemetery holds the remains of more than 15,000 people.

The atmospheric road was never meant to be so creepy.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

These fantastically named natural pools look like something out of a Scottish myth.

The world's largest collection of witchcraft regalia.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

The sign at the garden gate reads: "These Plants Can Kill."

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

15,000 year old bison sculptures.

The forbidden island of the Tuscan Archipelago may still contain buried treasure.

The glowing blue Nymphaeum of Emperor Tiberius.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

Nicknamed the "Museum of Horrors," this French anatomical collection has been fascinating visitors for over a century.

An ancient ossuary in Rouen.

The Devil’s own choice when he needs a drink in Brussels.

This Belgian palace was long the domain of priests and aristocrats but is now being turned into an art commune.

Folklore and history carved into Brittany's coast.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.