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

Village situated on a narrow volcanic escarpment.

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

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

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

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

Mysterious Spanish catacombs of unknown origins.

One of Europe's largest supercomputers is housed inside of a disused chapel.

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.

This house's itty bitty size means no humans allowed.

This Funeral Hearse Museum represents the finest in cadaver transportation.

Cliffside houses provide a spectacular view from their perch above the valley.

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

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

A Spanish town built into the cliffs.

A landscape decorated with enormous skull sculptures.

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

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

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

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

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

Commonly acknowledged as the only public monument to the Devil himself.

A Spanish forest is filled with mysterious stone carvings.