A magnificent, long-abandoned castle built in the wake of the reconquest of Spain.

A breathtaking and biodiverse wilderness in the mountain setting of Ernest Hemingway's "For Whom the Bell Tolls."

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

An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

The atmospheric ruins of a historic church can be found on a hill above the city of Oviedo.

The ruins of an ancient stadium that hosted gripping chariot and horse races.

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

This 47-story "M" needed 20 years to be completed

A five-square-mile slice of Spain on the Mediterranean coast of North Africa.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

A historic Christian shrine nestled within a spectacular natural cave.

Thanks to an acoustic anomaly, this unassuming stone bench has heard one hundred years of secrets.

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

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

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

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

Giant granite sculptures representing family on the northern coast of Spain.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

A medieval village holds a very modern hotel.

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

This ancient Spanish castle sits high upon a hilltop.