This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

This Funeral Hearse Museum represents the finest in cadaver transportation.

This amended headstone marks the grave of a participant in one of the most successful military deceptions of all time.

You can soak in three relaxing pools filled daily by the tide.

This imposing modern citadel started out as a home renovation project.

This beautifully verdant lagoon is tucked below a massive volcano in a crater atop a black pebble beach.

Seaside ruins of a settlement that date back to the first century B.C.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

A subterranean relic of the Spanish Civil War hides below this picturesque park.

The hidden ruins of an old hydroelectric plant reclaimed by nature.

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

This ancient Spanish castle sits high upon a hilltop.

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

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

Abandoned Nazi train station turned underground astroparticle laboratory.

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

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

Of course Salvador Dalí lived in a castle...

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

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

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

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

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

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