This eatery re-creates dishes from the Ottoman Empire so you can dine like a sultan.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

Religious dwelling in a Spanish volcano.

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

Abandoned waterpark turned counter-culture mecca.

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

A darkly erotic open-air statuary in Catalonia.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

Stunning Roman aqueduct used for 1900 years and still standing.

A completely underwater art museum sends a stark message about humans' impact on the environment.

An isolated village literally built into the crevices and rock formations of a mountain.

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

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

18th century anatomical amphitheater of the Royal College of Surgery of Barcelona.

One of Europe's largest supercomputers is housed inside of a disused chapel.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

An abandoned saucer-shaped monument in the Bulgarian mountains.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

The second-largest Jewish temple in Bulgaria was deserted after World War II, seized by the communist government and then abandoned again.