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

A once-secret library of Freemason history in Catalonia.

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

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

This Funeral Hearse Museum represents the finest in cadaver transportation.

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

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

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

Turntable anonymously received orphans, alms, and groceries.

Mountain where Jesus was first tempted by the Devil.

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

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

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

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

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

The internet as provided by a James Bond villain.

The world's largest model of our planetary system.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

Go inside to really appreciate this 500-year-old technological masterpiece.

David Sedaris called it "The greatest shop in the world."

A sunken idol welcomes parishioners to Davy Jones' Locker.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

This community on a small Venetian island has taken to painting their houses in bright neon hues.