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

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

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.

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.

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

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

Two stone columns flank the grand Venice square, but there were supposed to be three.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

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

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

2300-year-old Roman road connecting the empire.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

The largest bottled beer collection in the world holds over 22,000 unique beer bottles.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

The most loyal of little dogs, or a Victorian era publicity stunt?