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

Bioluminescent firefly squid light up this Japanese fishing port.

A natural gas leak provides a flickering flame beneath a waterfall.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

An ethereal glowing blue ocean cave in Croatia.

Fall down the rabbit hole into a surreal journey of human consciousness "from ass to soul."

A hip bar decorated with walls of golden skulls.

A Hawaiian stairway to heaven—that you can't climb.

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

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

A spectacular cave and a beguiling lake.

A beautiful geyser under environmental threat.

Hollowed out cedar log tubs set in an ancient towering forest.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

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

A serpentine highway twists and turns over the treacherous Norwegian Sea.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

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

Stunning wetlands ablaze with pink lotus flowers.