A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

A perfectly circular lake is formed by the crater of an ancient underwater volcano.

As the highest point in the Mid-Atlantic range this stratovolcano offers spectacular views.

This artful dam holds back a crater-made reservoir that can be seen from space.

This quirky museum will make you question everything, including the shape of the planet.

At least seven hues of blue and turquoise make this freshwater lagoon unique.

A flooded Mexican cave that hides a river beneath the water.

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

Prehistoric history as seen through the lens of an outsider artist.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

His music once banned in Communist Cuba, John Lennon is now immortalized in bronze by Castro, who considers Lennon a "fellow dreamer."

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

A subterranean house of worship carved right out of the bedrock.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

Home to three historic ships from the age of Vikings.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Palace where the nearly un-killable Rasputin was murdered.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

The oldest church in the Estonian capital is home to over 100 fantastical cemetery coats-of-arms.

"There's nothing there," and other lies the KGB told us.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The once highest point in China blends symbolic design with a kick of adrenaline.