The oldest Roman lighthouse still in use.

This ancient Spanish castle sits high upon a hilltop.

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

Mine shafts and hard pastries await visitors at this massive mountain of salt.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

A science fiction-inspired apartment building designed by a famous Spanish architect.

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

A charming Spanish village sits atop this natural limestone overpass.

Of course Salvador Dalí lived in a castle...

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Stunning Roman aqueduct used for 1900 years and still standing.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

A completely underwater art museum sends a stark message about humans' impact on the environment.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

Village situated on a narrow volcanic escarpment.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

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

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

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

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

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.