A spectacular walk on the flank of a gorge.

The remains of an encyclopedic sculpture garden later used as an internment camp.

Five million people are laid to rest here, more than the population of Madrid itself.

"Satisfying" is a good way to describe these beautifully aligned rows of Spanish mills.

This influential Renaissance-era library was once the haunt of kings and monks.

This underwater graveyard commemorates a group of murdered 16th-century missionaries.

The atmospheric ruins of a historic church can be found on a hill above the city of Oviedo.

A breathtaking and biodiverse wilderness in the mountain setting of Ernest Hemingway's "For Whom the Bell Tolls."

A magnificent place to see authentic paleolithic cave paintings that are an astounding 33,000 years old.

You can soak in three relaxing pools filled daily by the tide.

The largest prehistoric cemetery on the Balearic Islands dates back over 2,500 years.

This 47-story "M" needed 20 years to be completed

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

A Spanish artist builds his own castle.

The hidden ruins of an old hydroelectric plant reclaimed by nature.

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

An eerie collection of the surviving structures from a past celebration of the future.

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

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

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

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

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

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.