For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

A lush indoor jungle fills this bustling Madrid transportation hub.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

This colorful statue welcomes visitors to a Barcelona park.

An early 20th-century bullring converted into a modern shopping center.

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.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

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

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.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

An ancient knight and a symbol of the city's freedom.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Complex aquaponics systems allow fish and plants to grow in harmony.

The tunnel that runs beneath this former inn was once a hiding place for enslaved people seeking freedom.

A factory in Milwaukee where poop is reclaimed… and recycled.

What appears to be a wizard's lair in Milwaukee actually houses a massive water pipe.

One of the largest aviation events in the world brings half a million aircraft enthusiasts to Wisconsin each year.

The Bong-area park police have asked visitors to please, stop stealing the signs.

A wonderfully curated used bookstore in an airport.

This circus town museum recognizes the outstanding clowns of history.

A museum celebrating the self-taught artist-environment builder.