An eerie collection of the surviving structures from a past celebration of the future.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Mine shafts and hard pastries await visitors at this massive mountain of salt.

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

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

This lucky bronze frog was gifted to Madrid by a casino.

Mysterious Spanish catacombs of unknown origins.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

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

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

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

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

A completely underwater art museum sends a stark message about humans' impact on the environment.

A Spanish town built into the cliffs.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

Village situated on a narrow volcanic escarpment.

The world's largest wooden structure.

A landscape decorated with enormous skull sculptures.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

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