When the tide is high, you can see the Atlantic pushing up through a deep, jagged hole in the rock.

A ceramic-tiled room at the Seelbach Hotel said to have secret tunnels used by Al Capone and a crowd that helped inspire F. Scott Fitzgerald's 'The Great Gatsby.'

See four top-secret US spy aircraft of the Cold War era, including the legendary SR-71 Blackbird and the A-12 Oxcart.

One man's love for East Coast diner culture brought an entire eatery all the way from New Jersey to Colorado.

In the foothills of the lesser Caucasus, a centuries-old fortress still stands.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

Enormous statue of the Emperor of the Mongols.

The best way to get a sneak peek at the movies.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

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

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

The ruins of a medieval castle that once belonged to one of the most powerful families in the Netherlands.

A store full of vintage and indie toys designed to bring out the kid in even the crustiest of adults.

Poet William Blake penned some of his most famous work during his brief stay at this beloved country cottage.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

340-foot statue built to honour the Heroes of the Soviet Union.

An Inca spa, military outpost or maybe… both?

The Incas turned this ancient Wari aqueduct into an imposing defensive gate.

This Los Angeles animation studio is keeping the wonder of stop motion puppetry alive.

The house where the pulp fiction writer and Conan the Barbarian creator lived.

Sited in an Inner Mongolian desert are the remnants of an important trade stop along the Silk Road.

A mysterious bridge over a sunken Roman road.