This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

The summer home of the largest colony of bats in the world.

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

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

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

This species of wild goat stars in witchy legends and frolics among the park's eerie rock formations.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

This ancient Spanish castle sits high upon a hilltop.

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

The oldest Roman lighthouse still in use.

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

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Moorish signal station on a stratgic rocky outcrop.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

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

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

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

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

Wonderland replication in progress by one persistent man.

A lush indoor jungle fills this bustling Madrid transportation hub.

A beautiful but toxic fountain of mercury.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.