Walk through living pictures and music in the Cathedral of Images.

The sunlight passing through the opening of this huge cave system creates a magical effect.

A spiritual sanctuary in a natural cave.

Mummified monks and the accidentally interred, in a 17th-century crypt.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

Semi-precious Blue John stones have been mined in this cavern system for centuries.

This massive subterranean fissure is known as the "underground Grand Canyon."

The final resting place of one of Germany's most accomplished Renaissance men.

This bone-filled cave got its name after they found 140 bear skeletons inside.

This strange sculpture depicts a giant nightmare hare crushing a man to death beneath its colossal bulk.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

The oldest inn in England served brew to the crusaders.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

In this truly magical place, rent hasn't been raised since the year 1520.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

Ride a boat through this magnificent underground world, which now doubles as a theater.

An enormous sinkhole that local lore attributes to the anger of the Virgin Mary.

An unusual cave filled with rare alien-looking aragonite formations.

"The Wonder From Down Under," a worm shaped museum celebrating the endangered Giant Gippsland earthworm.

The first tourist attraction to offer tours for interstellar tourists.

An ancient engraving by the Cammeraygal people was uncovered in the transformation of a North Sydney industrial site.

Nine limestone rock stacks on Australia's "Shipwreck Coast."