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

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

A book bound in the skin of an infamous criminal, along with countless other specimens.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

A 18th century graveyard and its astonishing cortege of macabre iconography.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

1% of Greenland's entire population used to live in this single building, which is now slated for demolition.

Thousands of letters to Santa get delivered to this mailbox in Greenland.

Walrus skulls and narwhal bones were found here while excavating a 900-year old church.

Neither bomb blasts nor heartbeats escape the giant ears of this super sci-fi Arctic outpost.

In a country where driving from one town to another is literally impossible, this small stretch of gravel is a remarkable feat.

This remote research station sits amid the second-largest ice sheet on the planet.

Small Island off the coast of Greenland.

A Cold War atomic camp buried under the ice is now emerging because of global warming.

The 3.8 billion-year-old rock proves that tectonic plates may have been shifting longer than we thought.

A surprisingly beautiful abandoned World War II military base in East Greenland.

Chef Lawrence West serves up Indian tacos, wojapi, and other Lakota dishes at the brick-and-mortar incarnation of his popular food truck.