This 1920s Dutch barge is now a floating bookstore.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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

At just 51 feet and 10 inches long, it's the shortest street in England.

A replica of the steam engine that hauled Queen Victoria's Royal Train is on display at Windsor.

This monument to those fallen in the World Wars is accompanied by a U-boat that Germany bought for a Deutsche Mark.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Carved fountains poignantly placed in parks and in front of special monuments.

The footprint of a frustrated devil in Munich's Cathedral.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

The silly symbol for an underground protest group is now scattered around the city.

This oddly beautiful water cistern is a techno-temple to the wet stuff and a multimedia masterpiece.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

The modern birthplace of Irish freedom.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

Special benches that play Chopin's music are scattered throughout his native city.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.