Walk into an underground archeological dig, the site of the Roman Forum that was once the center of Valencia.

This small cemetery and its chapel are located in the middle of a traffic circle.

The defensive tower was built centuries ago to warn locals of Berber pirate attacks.

Replicas of fossils unearthed during renovation work reveal how this area would have looked millions of years ago.

See replicas of Europe's most famous cave paintings and even some of the animals that feature in the art.

The ruins of an ancient Celtiberian town with incredible rock-cut buildings and a Roman aqueduct.

Abandoned 18th century weapons factory in the Aezkoa Valley.

Religious dwelling in a Spanish volcano.

Haunted tuberculosis hospital built by the patients.

Stormy conditions send jets of seawater bursting through holes in the cliffs.

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

Beautiful tiles decorate many of the town's surfaces and stand testimony to its glorious artistic history.

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

The unexpectedly beloved remnants of a controversial thermal power plant.

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

Giant topiary dog once played a role in a terrorist bomb plot.

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

Geological storytelling.

12th-century holy complex shares land with a natural park full of heavenly waterfalls and raptors.

Stuck in the middle of a modern Madrid city block are the remains of a 19th century sports complex.

A micro-communist utopia in Spain with no police, no mortgages and full employment.

This fascinating and poignant museum chronicles every imaginable aspect of Spanish colonialism in the Americas.

An early 20th-century bullring converted into a modern shopping center.

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