This wonderful rock formation constitutes the first geopark in Uruguay.

These caves are home to a small church and were used to age cheese.

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

A once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.

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

A Spanish town built into the cliffs.

A Spanish forest is filled with mysterious stone carvings.

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

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

Bacteria and algae give the salty water its bubblegum hue.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

This cemetery features modernist statues as strange as its name.

This semi-secret storybook hedge maze is also the oldest garden in the city.

The oldest building in Madrid.

Stop by, and you'll receive a map to two well-preserved ancient petroglyph sites.

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

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

An iconic photograph from the Spanish Civil War saved this shrapnel-scarred historic house from destruction.

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

A subterranean relic of the Spanish Civil War hides below this picturesque park.