This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Catering to broken dolls for almost 200 years, this repair shop is now a charnel house of doll parts.

A 16th-century Andalusian palace.

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

American soldiers discovered Europe's best one-liner at the end of World War II.

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

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

A Spanish town built into the cliffs.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

A micro-communist utopia in Spain with no police, no mortgages and full employment.

Mysterious face-like images that appeared within an Andalusian house are surrounded by legends of the paranormal.

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

Haunted tuberculosis hospital built by the patients.

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

12th-century holy complex shares land with a natural park full of heavenly waterfalls and raptors.

Hidden well off the beaten path in Catalonia is this crumbling medieval castle that is slowly being covered in graffiti.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

This chest hospital with a dark, haunted past serves as a fitting set for horror films and a paradise for ghost hunters.

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

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

Super Robot anime statue guards a forgotten suburban development in Tarragona.

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

An independent naturist colony amidst 1000-year-old ruins.