18th century anatomical amphitheater of the Royal College of Surgery of Barcelona.

Of course Salvador Dalí lived in a castle...

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.

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

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

A charming Spanish village sits atop this natural limestone overpass.

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

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

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

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.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

A landscape decorated with enormous skull sculptures.

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

A Spanish forest is filled with mysterious stone carvings.

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

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

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

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

This cafe offers a curated collection of treats and tipples made by monks and nuns.

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

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