A stately palace has been converted into the world's largest cannabis museum.

Turntable anonymously received orphans, alms, and groceries.

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

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

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

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

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 gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

A surprising and unconventional mosque hidden in the subsoil of Istanbul.

Taking the subway here means doing so over a bridge located in the middle of an estuary.

This airport also offers travelers the chance to view thousands of years of Turkish history.

Turkish adventurer antiques in the heart of the Grand Bazaar.

A fountain standing as a testament to a doomed alliance.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

This abandoned Slovenian military barracks has become a punky-political art squat.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

Where the lovelorn find a home for their sentimental keepsakes.

Colorful power station with a chimney equipped with a gallery for exhaust monitoring equipment.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

A whimsical bridge adorned with decorative dragons.