For those with no fear of heights: a skywalk 4,700 feet up on a Chinese mountain.

Naked scientists race around the pole in the frigid cold to try to join Antarctica's exclusive 300 Club.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

Buildings from the fictional planet of Tatooine still litter the Tunisian desert.

Stay in your own little bubble.

This historic observatory was established to keep shipwrecks from littering the Cape of Good Hope.

The souls of the dead have made these Ghanese crocodiles shockingly docile.

This series of rope-style bridges brings visitors into a jungle layer that is usually reserved for birds and monkeys.

Deadliest lake in the world suffocated over 1,746 people in one night.

Dozens of snakes are housed and worshipped within the walls of this Vodun temple.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

This encrypted monolith protected a secret of Norse mythology by hiding in a church wall for over a millennium.

The world's first ice hotel is still one of the most elaborate and beautiful.

Bring your hiking shoes, wool socks, and thermal underwear for a stay in these cozy forest huts.

Research station devoted to mysterious floating lights seen in a Norwegian valley.

Walk behind a 50-meter-high waterfall.

Cold storage for agricultural biodiversity.

Home to three historic ships from the age of Vikings.

A stunning silver lining to global warming's gloomy cloud.

This giant boulder is pinched over a 1000-meter abyss by two mountains.

Walk 2,300 feet above the ground on the "Troll's Tongue."

One of the deepest indoor swimming pools in the world.

The world's largest occupied bat houses hold hundreds of thousands of flying mammals.

A popular swimming hole that hides one of America's most deadly diving spots.