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

An impressive display of ships and artifacts from the ancient Mediterranean maritime trade.

The two massive guns that defended Cartagena Bay.

A mud brick kasbah with a history of lavishness and traitorship.

A fortified city, home to a remaining population of five families

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

A beautiful but toxic fountain of mercury.

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

Week-long block party becomes a competition for the best decorated street.

Mountain where Jesus was first tempted by the Devil.

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

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

This semi-secret storybook hedge maze is also the oldest garden in the city.

This cemetery features modernist statues as strange as its name.

Turntable anonymously received orphans, alms, and groceries.

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

The odd cement nubs littering this Spanish square are actually the entrances to a series of buried silos.

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

A daily pyrotechnic celebration marks a beloved tradition during Valencia's festival season.