Moss and stone turn this waterfall into an otherworldly liquid veil.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

This generously endowed statue once stood guard outside a Roman home.

On the wall of this medieval square, a symbol of the Spanish Inquisition.

Barcelona's only remaining tram system takes riders to the Tibidabo funicular.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

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

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

This Funeral Hearse Museum represents the finest in cadaver transportation.

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

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

Turntable anonymously received orphans, alms, and groceries.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

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

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

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

A beautiful but toxic fountain of mercury.

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

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

A wunderkammer of exoticism immortalized by Tom Waits.

Executed in 1401, Exhumed in 1878, Stolen in 2010.

Wax models of disease and deformity are on display at this German medical museum.