Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

This ancient Spanish castle sits high upon a hilltop.

Famed architect Antoni Gaudi built this generous thank you gift to a friendly host who housed him during a job.

Moorish signal station on a stratgic rocky outcrop.

A Romanesque tower appears when water levels drop.

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

The earliest known map to show America, discovered by accident at a Paris bookshop.

Stunning Roman aqueduct used for 1900 years and still standing.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

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

A lush indoor jungle fills this bustling Madrid transportation hub.

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

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

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

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

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

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

This cemetery features modernist statues as strange as its name.

This medieval chapel is now a shrine to the region's favorite sport.

The approximate spot where the last Grand Master of the Knights Templar was put to death.

The site of the first medieval crusade that pitted Christians against Christians.

What if all public housing projects had been designed by "the Pygmalion of modern architecture," not only their prototype?

Experience architect Le Corbusier's modernist design for living in the home he designed for himself.

Wall after wall of this French seaside neighborhood is intricately decorated with seashells and corals.