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

World's strongest whirlpool.

Roughly 17 million letters to Santa have found their way to this Arctic Circle post office.

If you visit Santa's village, you can get your passport stamped to show you crossed into the Arctic Circle.

Four giant movable street lights decorate this modern Rotterdam square.

In the Netherlands, one of the world's largest private car collections can be found.

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

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

Ship-sized kinetic sculptural fantasy.

An architectural oddity hides in plain sight on this iconic London bridge.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

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

A unique tribute to the millions of animals who served and died for the British military.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

Water and windows define this defensive Italian well.

Fantastic views and thousands of love locks.

This demon atop the Notre-Dame de Paris looks utterly bored.

What looks like a normal building is really a hollow facade hiding a subway vent.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

A market built atop boats is one of the few floating holiday markets in Europe.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

This unique bridge physically lifts a piece of the road into the air to let boats pass by.