An art world insider finds himself battling for his artistic home.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

Live-in sculpture begun by one family in 1979.

This abandoned racetrack looks like it is set to hold competitions in the apocalypse.

A medieval village holds a very modern hotel.

An abandoned nightclub has become a vibrant work of art.

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

The prolific artwork of a self-taught sculptor.

Translating as "The Jump of the Girlfriend," this stunning waterfall has a tragic legend behind it.

This magical space partly designed by Antoni Gaudi is one of the best examples of romantic gardening in the Mediterranean.

Housed in a 1912 architectural masterpiece, this outlet of the Golden Arches is a real beauty.

This tunnel was built in order to protect the village of Daroca from flash floods during rainy seasons.

Continental Europe's only museum devoted to salt and pepper shakers features more than 20,000 designs.

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

This parody of ecclesiastical cloisters features famous figures from the 20th century.

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

Beneath the city of Lourdes, France is a massive, concrete church.

Sanctuary on a ridge near an ancient shrine to a "Black Madonna" built by the founder of Opus Dei.

A series of recreated fortifications mark George Orwell's path through the Spanish Civil War.

An arresting arch punched straight through a mountain provides one of the most scenic spots, and challenging climbs, on the planet.

Abandoned Nazi train station turned underground astroparticle laboratory.

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

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