The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

The atmospheric road was never meant to be so creepy.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

Furniture tries to escape an abandoned building in San Francisco.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

The hidden lair of an alchemist rediscovered in a 2002 flood.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

The largest of London's subterranean rivers and once a mad, bad center of London life.

Two stunning 17th-century libraries and a cabinet of curiosities.

The first declared National Monument in the United States.

Northern Ireland's Brobdingnagian stepping stones.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

A seemingly endless landscape of pure salt stretches far across Bolivia.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

The world's largest collection of witchcraft regalia.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Most-visited and most-photographed slot canyon in the American Southwest.