This floating cinema brings new meaning to the phrase "going out" to the movies.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

The hottest place on the planet.

This vast, water-filled underground labyrinth can only be toured by boat.

The world is full of swimming holes, but few compare to Samoa’s idyllic To Sua ocean trench.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

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

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

This collector's home is a constant work in progress.

This rickety old shed hides a trove of secondhand literary treasures.

A brilliant turquoise lake in the mountains.

Mountain where Jesus was first tempted by the Devil.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

This one-time health resort was used by aristocrats around the world.

Italian cave with exceptional acoustics and an unsavory history.

Fascinating town where normal life interfaces with the occult.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

An extraordinary mixture of natural beauty and man-made phenomena.

One man has installed bathtubs into the Utah desert floor to harness the powers of a natural hot spring.

Rustic natural hot springs in the deciduous rain forest.

A beautiful oddities shop crammed with strange and morbid curiosities.

The secret medieval communication system will whisk your words above the noise of the crowd.

Nestled in the heart of Milan is a real wunderkammer of morbid curiosities.

Tucked away between two 19th-century buildings, this small shop specializes in the macabre.