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

Eat a Nobel banquet from any year in the basement of Stockholm's City Hall.

This unique sculpture is often overlooked by pedestrians.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.

An abstract representation of weather in Sweden.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

This small museum nestled inside a souvenir shop is dedicated to Sweden's most well-known toy.

A 130-year-old urinal is the oldest of Stockholm and perhaps all of Sweden.

A king's bloodstained shirt is among the gruesome collection of artifacts displayed below Stockholm's Royal Palace.

Built to hold the worst of the worst of the Nazi war prisoners.

A pile of earth left over from a water supply project was converted into an anti-aircraft installation during World War II.

The unusual clock on this 18th-century market building has an extra minute hand for "Bristol time."

Banksy's image of a naked man dangling from the window of a sex health clinic.

This pedestrian footbridge honors Pero Jones, an enslaved African who lived in Bristol.

A museum celebrating the Canadian forces that liberated Belgium from the Nazis replete with battlefield miniatures and multiple Gardens.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

This temple to the sturm and drang of Richard Wagner contains a dragon's cave and reptile zoo full of living "dragons."

A ruined castle stands atop a hill surrounded by dragon lore.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

The bones of the Biblical Magi traveled to Constantinople and Milan before landing in their current home inside an elaborate golden reliquary in the Cologne Cathedral.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

A unique bridge with an equally unique view.