A 16th-century Andalusian palace.

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

Founded as a refugee camp, now a popular tourist spot.

Single runway interrupted by a busy road that cuts across its middle.

At this faithfully preserved medina off the Moroccan tourist circuit you can walk through six centuries of history in one day.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

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.

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

Abandoned Nazi train station turned underground astroparticle laboratory.

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

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

A medieval village holds a very modern hotel.

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

Geological storytelling.

Cliffside houses provide a spectacular view from their perch above the valley.

Whether they are bulls or pigs, these ancient animal sculptures are fascinating relics.

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

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

Mysterious Spanish catacombs of unknown origins.

A huge cathedral single-handedly constructed by one eccentric monk.

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

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

An ancient Egyptian temple in the middle of Madrid, Spain.