A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.

A plaque marks the house in Stockholm where the French philosopher René Descartes lived up until his death.

A former suicide bridge is now accumulating symbols of love instead of a body count.

Stockholm's narrowest alley is barely over two feet wide.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

The single richest source of elemental discoveries in the world.

It's always game time at Stockholm's only museum devoted solely to video games.

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

Stockholm's deepest subway station is also a stunning ecological wonder.

The library's graceful rotunda is like a bibliophile's temple.

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

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

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

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

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

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.

Turntable anonymously received orphans, alms, and groceries.

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

An early 20th-century bullring converted into a modern shopping center.

Be on the lookout for the symbolic insect all over the city.

Manchester salvaged this sculpture of the adopted Mancunian when it was no longer wanted in Ukraine.