Camels and crocodiles share the black waters of this stunning Saharan oasis.

Norway has built what may be the world's most beautiful public toilet.

Blue-green pools and smooth stones comprise one of Spain’s most idyllic hidden wonders.

The location of Puerto Rico's first water bottling plant, thanks to a collaboration between Mother Nature and technology.

An enchanting natural wonder in Puerto Rico's Camuy River Park.

The blowhole bursts spectacularly right next to the buildings in a medieval seaside town.

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

This army of concretions is an unexplained geological phenomenon unlike anything else in the world.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

This 19th-century island fort built to protect against an invasion by sea.

Eerily lifelike effigies stare at everyone who enters this sanctuary.

A wildlife paradise, this island is one of the world’s most important habitats for burrow nesting seabirds.

The remains of a small medieval chapel mark the legendary birthplace of the patron saint of Wales.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

Dozens of elegant ceramic tiles decorate these ancient walls, each displaying the Lord's Prayer in a different language.

The Dead Sea Scrolls were discovered in the ruins of this ancient monastic community.

It was an experiment to prove that glacial boulders and rocks can be used in constructions and dwelling.

One of the most ethnically diverse spots on the planet.

Witness traditional silk production in the Uzbek city that's been a hub of sericulture for over a thousand years.

This ruined folly was originally built to honor a failed American state that would have become "Westsylvania."

A slightly surreal menagerie of structures that were lovingly spared from demolition and reconstructed in a field.

Beautiful Victorian buildings from L.A.'s forgotten architectural past.

The small Scottish townhouse where the "Father of the National Parks" was born.