The effect of this ancient form of image projection situated atop an 11th century Moorish palace is thrilling.

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.

Order cookies baked by cloistered nuns in a 400-year-old monastery.

A spectacular walk on the flank of a gorge.

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

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

The walls of these four caverns are filled with art that dates back to the earliest human presence in Europe.

Remains of the lost church hide beneath this Spanish Parliament building.

The streets of a sleepy Spanish town proudly exhibit some of the world's finest graffiti.

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

A modernist church in an ancient village.

This overlooked museum houses an amazing collection of rare, antique typewriters.

This mountaintop observatory is home to one of the world's largest reflective telescopes.

A huge cathedral single-handedly constructed by one eccentric monk.

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

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

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

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

This amended headstone marks the grave of a participant in one of the most successful military deceptions of all time.

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

A whimsical garden of outsider art in the Spanish countryside.

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

Inside this church are the alleged remains of the patron saint of lovers, epileptics, and beekeepers.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.