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

This semi-secret storybook hedge maze is also the oldest garden in the city.

These striking ruins of a castle resemble a ship's stern.

Mountain where Jesus was first tempted by the Devil.

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

Hidden well off the beaten path in Catalonia is this crumbling medieval castle that is slowly being covered in graffiti.

Stunning Roman aqueduct used for 1900 years and still standing.

An isolated village literally built into the crevices and rock formations of a mountain.

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

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

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

Geological storytelling.

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

"Alleys of Stone" form natural mazes in Spanish natural park.

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

Abandoned 18th century weapons factory in the Aezkoa Valley.

A small church ornamented with medieval erotic sculptures.

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

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

An archeological treasure trove stumbled upon by a couple of children.