The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

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

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

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

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

Blue-green pools and smooth stones comprise one of Spain’s most idyllic hidden wonders.

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

Rare karst landscape eroded from a flat seabed.

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

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.

A Spanish town built into the cliffs.

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

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

A lush indoor jungle fills this bustling Madrid transportation hub.

Commonly acknowledged as the only public monument to the Devil himself.

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

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

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

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.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.