Natural time capsule containing an alien ecosystem.

A fifth-century temple improbably built into the side of a cliff.

Take a drunken tour inside the world's largest known geode.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

Tubing through a cave lit with glowworms is a magical underground experience.

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

Stalactites and stalagmites in a beautifully lit cave.

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

A gargantuan crystal kingdom.

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

Every autumn, this hillside is ablaze with red summer cypress.

An isolated dive site teeming with cnidarians.

A beautiful geyser under environmental threat.

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

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

A spectacular cave and a beguiling lake.

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

These fantastically named natural pools look like something out of a Scottish myth.

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

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