Earth's rocky history has rarely glittered so brightly as it does in this Spanish museum.

Moorish signal station on a stratgic rocky outcrop.

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

This magical space partly designed by Antoni Gaudi is one of the best examples of romantic gardening in the Mediterranean.

Abandoned Nazi train station turned underground astroparticle laboratory.

Of course Salvador Dalí lived in a castle...

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

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

One of the largest ossuaries in Spain is packed from floor to ceiling with bones.

A charming Spanish village sits atop this natural limestone overpass.

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

Mysterious Spanish catacombs of unknown origins.

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

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

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

Cliffside houses provide a spectacular view from their perch above the valley.

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

Village situated on a narrow volcanic escarpment.

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

A Spanish town built into the cliffs.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

This Funeral Hearse Museum represents the finest in cadaver transportation.

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

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