Salaguti's live-in museum: a fortress against criticism and consumer art.

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

This abandoned naval battery stood at the ready as recently as the 1980s.

Originally slated to become a luxurious resort, this structure is now a graffiti haunt reclaimed by nature.

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

Religious dwelling in a Spanish volcano.

A spectacular walk on the flank of a gorge.

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

The extensive relics of an ancient Roman and Phoenician fish processing plant hide in a town park.

Haunted tuberculosis hospital built by the patients.

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

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

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

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

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

The oldest Roman lighthouse still in use.

Madrid's last horchata kiosk is a blue-and-white beacon of refreshment.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

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

This house's itty bitty size means no humans allowed.

An architect transformed this abandoned cement factory into his castle-like workshop.

Nearly three tons of weapons from the Vietnam War still remain in this small, hidden museum.

Meant to be a lavish presidential home, the palace became a symbol of the fall of South Vietnam.

This French colonial post office is arguably the grandest in all of Southeast Asia.