This "flat geyser" bubbles up out of the ground periodically like a disappearing river.

A reproduction of the famous prehistoric cave paintings is hidden underground at the National Archaeological Museum.

Peek into a cave of giant, glimmering crystals.

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

This ancient Spanish castle sits high upon a hilltop.

Translating as "The Jump of the Girlfriend," this stunning waterfall has a tragic legend behind it.

Giant granite sculptures representing family on the northern coast of Spain.

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

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

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

The oldest Roman lighthouse still in use.

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

A beautiful little museum hidden away in the heart of Barcelona holds a treasure trove of Ancient Egyptian artifacts

This fascinating and poignant museum chronicles every imaginable aspect of Spanish colonialism in the Americas.

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

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Moorish signal station on a stratgic rocky outcrop.

A Romanesque tower appears when water levels drop.

Blue-green pools and smooth stones comprise one of Spain’s most idyllic hidden wonders.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

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

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.