A historic Christian shrine nestled within a spectacular natural cave.

Salaguti's live-in museum: a fortress against criticism and consumer art.

An old wool-washing house filled with Fluxus contemporary art.

Haunting monument to the German Jewish philosopher who died while fleeing fascism.

An abandoned socialist utopia built in the late 19th century.

During an annual Catholic feast in this tiny Spanish village, men dressed as devils leap over rows of babies to cleanse them of sin.

This charming, medieval walled village is Spain's first "book town."

A complimentary beverage is offered to the bodega's resident rodents every day.

A whimsical garden of outsider art in the Spanish countryside.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

This mountaintop observatory is home to one of the world's largest reflective telescopes.

A modernist church in an ancient village.

This 47-story "M" needed 20 years to be completed

An outsider folly near Madrid.

This overlooked museum houses an amazing collection of rare, antique typewriters.

Spain's stunning solar energy plant.

Thanks to an acoustic anomaly, this unassuming stone bench has heard one hundred years of secrets.

A Spanish artist builds his own castle.

On La Gomera, "Silbadors" communicate in a 4,000-word language of whistles.

A huge cathedral single-handedly constructed by one eccentric monk.

A science fiction-inspired apartment building designed by a famous Spanish architect.

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

Abandoned waterpark turned counter-culture mecca.

Earth's rocky history has rarely glittered so brightly as it does in this Spanish museum.