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

The site of a legendary battle immortalized in medieval literature.

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

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

This tiny river island switches sovereignty every six months as part of a rare, centuries-old agreement.

The oldest operating roller coaster of its kind, the Montaña Suiza has been thrilling riders since 1928.

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

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

The oldest Roman lighthouse still in use.

This humble bench is considered the most beautiful in the world.

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

This stop on the Camino de Santiago stands high above the underwater ruins of a medieval town.

Devastated landscape used for hundreds of years by the Romans as their primary mining site.

This enormous censer uses a pulley system installed over 400 years ago.

These Bullet-scarred bunkers are haunting reminders of the Spanish Civil War.

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

According to tradition, King Phillip II supervised construction of the seat of his empire from this seat carved into rock.

This 18th-century project to build the world's tallest gravity dam was never completed.

An ode to the famous Las Vegas signage.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

Meant to resemble a massive tree, the building is the best example of Spanish organicist architecture in Madrid.

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

An iconic and controversial ancient Iberian funerary urn with a hauntingly penetrating gaze.

A reproduction of the famous prehistoric cave paintings is hidden underground at the National Archaeological Museum.