This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

Catalonia Tradition: Beating the hollow Christmas log until it defecates in your fireplace.

Mountain where Jesus was first tempted by the Devil.

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

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

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

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

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

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

A beautiful but toxic fountain of mercury.

This cemetery features modernist statues as strange as its name.

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

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

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

Hear the quietest sound from across the dome.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

France's most famous cemetery, with some of its most curious tombs.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Famously misunderstood wonder of the ancient world

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.