The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

This artificial cave looks like something out of a fairytale.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

A medieval village holds a very modern hotel.

A darkly erotic open-air statuary in Catalonia.

This century-old ruined temple was reborn as "The Church of Skate."

An eccentric collection of antique items shares space with a prop-quality witchcraft museum.

Famed architect Antoni Gaudi built this generous thank you gift to a friendly host who housed him during a job.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

One of the largest ossuaries in Spain is packed from floor to ceiling with bones.

The morbid items in this small and hidden museum are not for the weak stomached.

The world's largest wooden structure.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

A Spanish town built into the cliffs.

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

An architect transformed this abandoned cement factory into his castle-like workshop.

A Spanish forest is filled with mysterious stone carvings.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Wonderland replication in progress by one persistent man.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.