A neolithic tomb converted into a tiny chapel.

An abandoned mine now resembles a post-apocalyptic landscape of derelict buildings and blood-red pools of water.

A New York–based physician returned home to Spain to build his own elaborate monument to Christopher Columbus.

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

More than 70 detailed dioramas—including some rather nontraditional ones—fill this charming museum.

Holding the current title of "biggest chair in the world," it stands with little fanfare in Lucena, Spain.

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

An abandoned airport in the middle of nowhere.

A series of colorful murals breathes new life into old grain silos in Spain.

A whimsical garden of outsider art in the Spanish countryside.

These ruins are all that remain of Tortosa’s lost coal gas manufacturing industry.

A botanical garden full of thought-provoking contemporary sculptures.

The ruins of a bombed medieval village memorialize the destruction of the Spanish Civil War.

A signal indicates the entrance to this alley, rumored to be a meeting place for witches.

An isolated village literally built into the crevices and rock formations of a mountain.

This medieval fortification has weathered the centuries better than any other structure from its era.

A functioning Roman-era aqueduct and bridge in rural southwest France.

This castle-fortress is a living example of the transition from medieval defenses to modern fortifications.

The world's largest solar furnace uses 10,000 mirrors to concentrate the sun's rays to generate power.

A precariously balanced goose-shaped boulder with a dark legend.

More than 140 granite sculptures decorate the lawn of this French sculptor.

Natural mummies hidden in the crypt of a medieval French church.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

This former limestone quarry is now a subterranean wonderland of grand stonework.