The world's only museum devoted to the wonders of fluorescence.

A spectacular cave and a beguiling lake.

The tallest stationary dunes on Earth also happen to sing.

Stalactites and stalagmites in a beautifully lit cave.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

Enchanting cave with a river crashing through the roof.

Cathedral carved out of salt, located a mile below the earth's surface.

An explosion of natural color known as "the river that ran away from paradise."

A swing to dangle you off the very edge.

A dangling church built over a Colombian gorge.

One of the world's largest ice festivals dazzles visitors for over a month with radiant sculptures and carvings.

One of the greatest maze designer’s greatest mazes.

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

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.