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

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

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

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

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

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

Devastated landscape used for hundreds of years by the Romans as their primary mining site.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

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

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

A site where “the ravages of the war are more striking…than any other place in contemporary Spain.”

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

The world's largest wooden structure.

Stunning Roman aqueduct used for 1900 years and still standing.

Village situated on a narrow volcanic escarpment.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Abandoned Nazi train station turned underground astroparticle laboratory.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

The final resting place of the great navigator, or maybe his brother.

A temple to modernity, tucked away amid Barcelona's more well known museums.

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

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.