Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A micro-communist utopia in Spain with no police, no mortgages and full employment.

This amazing oasis of art and plants is hidden on the outskirts of Marrakesh.

This sanctuary is home to donkeys who finally get to rest after a life of toil.

This record setting conveyor belt system can even be seen from space.

In this desolate valley resides a gorgeous set of rocks sporting a technicolor design.

Ibi's pioneering toy factory now houses two small but mighty museums.

A fiery-red region of scooped out land still largely untouched by civilization, tourists or otherwise.

This ancient tunnel is one of the most important examples of Roman hydraulic engineering in Spain.

12th-century holy complex shares land with a natural park full of heavenly waterfalls and raptors.

The ruins of an ancient Celtiberian town with incredible rock-cut buildings and a Roman aqueduct.

Abandoned blockhouses from Nazi Germany's Atlantic Wall erode into the sea on a French beach.

A landscape decorated with enormous skull sculptures.

A tiny, forgotten park of surrealist sculptures in Angouleme.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

The bizarre home and sculpture garden of an eccentric artist.

The vibrant buildings in the “capital of the comic strip” celebrate the art form that made it famous.

Artist and musician Will Menter creates musical sculptures.

The experimental test tracks of a retro-futuristic monorail still stand in the French countryside.

Peeing dogs guard the Roman hunting goddess atop a fountain at France’s Château de Fontainebleau.

Climbing to the top of the cathedral's bell tower offers sweeping views of these medieval ruins.

No one knows who built this strange cave of worship or exactly why.

A medieval church built up to defend its village.

Even drowned in an ocean of toxic waste, the remnants of this Romanian village stand tall.