A church of bones, decorated with 40,000 human skeletons.

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

An emerald-green grotto just a short trip from Austin.

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

A huge musical instrument played by the ocean.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The atmospheric road was never meant to be so creepy.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

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

Largest lake in Great Britain measured by surface area.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

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

Mysterious glowing orbs float through the desert night.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Witness to many historic moments in early Texas history.

The largest land animal skull ever discovered.

Official museum, hall of fame, and repository of the Texas Rangers.

Natural catch-basin rocks covered in thousands of drawings spanning many millennia.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

Civil War dumping ground for the bodies of terrorized Union sympathizers.

Australian Lake set aglow by Noctiluca Scintillans.

One of the best beaches in the entire world.

This dramatic sea spire is home to the world's rarest insect and is part of the lost continent of Zealandia.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.