A living art gallery painted on a canvas of Monterey pine trees.

The oldest Roman lighthouse still in use.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

Rare karst landscape eroded from a flat seabed.

Devastated landscape used for hundreds of years by the Romans as their primary mining site.

This ancient Spanish castle sits high upon a hilltop.

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

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

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

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

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

Moorish signal station on a stratgic rocky outcrop.

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

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

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

Abandoned Nazi train station turned underground astroparticle laboratory.

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

Mysterious Spanish catacombs of unknown origins.

Cursed swimming pool left abandoned is now a favorite of filmmakers and ghost hunters.

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

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

Bacteria and algae give the salty water its bubblegum hue.

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

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.