The atmospheric road was never meant to be so creepy.

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

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

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

The world's largest collection of witchcraft regalia.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

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

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

One part local history, 99 parts gruesome haunted house.

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

This "floating railway" is one of the world's oldest monorail systems.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

"The most colorful grottoes of the world.