A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

This doorless 20th-century elevator doesn't stop or slow down.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

Two stunning 17th-century libraries and a cabinet of curiosities.

Walk through Czech history in Prague's largest graveyard.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

This fountain was designed to honor the man who helped bring water to Barcelona.

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

For one day every month Barcelona's Estació de França transforms into a market for model trains.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

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

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

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

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.

Massive installation of Europe's negative stereotypes.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

This network of conjoined cellars was riddled with traps and supposedly allowed the townspeople to pretend their homes were deserted.