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

The world's largest solar furnace uses 10,000 mirrors to concentrate the sun's rays to generate power.

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

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

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

Marvel at this immense work of art that greets arrivals to the city.

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

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

This modern sculpture looks out over the sea and amplifies sound from the inside.

The atmospheric ruins of a historic church can be found on a hill above the city of Oviedo.

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

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

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

The most elaborate of 12 medieval arched doorways to the old city of Burgos.

The site of a legendary battle immortalized in medieval literature.

For this chef, an active volcano is his oven.

This medieval synagogue survived the Inquisition as a hospital and church.

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

Spain's largest bullring offers a unique glimpse at architecture and history.

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

A complimentary beverage is offered to the bodega's resident rodents every day.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

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

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.