A must for film lovers in Madrid and home to the Spanish Film Library's projection space.

A wonderful collection of fossilized dinosaurs and other creatures that roamed the landscape millions of years ago.

An abandoned socialist utopia built in the late 19th century.

Abandoned tunnels dug for the once-thriving sea salt industry on the coast of southern Spain.

In Spain, the ruins of a Roman military camp sit along a flooded section of a river.

A neighborhood park in the city of Cáceres hides what some believe are revolutionary examples of Neanderthal cave art.

A five-square-mile slice of Spain on the Mediterranean coast of North Africa.

This Arab fortress was once the largest citadel in Western Europe.

A series of recreated fortifications mark George Orwell's path through the Spanish Civil War.

Lava stone structures possibly dating back to the 19th century may have been a stopping point for voyagers between ancient Egypt and the Mayan Civilization.

The largest medieval water tank on the Iberian Peninsula is preserved beneath the Cáceres Museum.

An arresting arch punched straight through a mountain provides one of the most scenic spots, and challenging climbs, on the planet.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

A modernist church in an ancient village.

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.

This 7,000-year-old megalithic wonder covered by a Franco-era reservoir emerges in times of drought.

These primitive rock paintings include a very beloved depiction of a woolly mammoth.

Beautiful tiles decorate many of the town's surfaces and stand testimony to its glorious artistic history.

Hundreds of caves once used to store grains and animal feed.

This generously endowed statue once stood guard outside a Roman home.

A hidden medieval crypt where a famous legend says the devil used to teach black magic.

Now a pile of ruins and rubble, this was a lovely mountain town as recently as 1960.

A spectacular walk on the flank of a gorge.

This 19th-century fountain's namesake animal isn't what you think it is.