Paris' linguistic guide to the international language of, yes, love.

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

The video game-themed street art first popped up in the French city.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

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

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

Hear the quietest sound from across the dome.

A wonderfully eccentric Victorian-era museum and library.

A defensive structure built during the Hundred Years War has remained useful in one way or another for nearly 700 years.

A set of medieval stained-glass windows tell the gruesome story of a Viking siege.

Inspired by Thomas Stothard's painting of the "Journey to Canterbury," albeit with Canterbury natives.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The Tudor-style cottage in the middle of the square is not quite what it seems.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

The broken skateboards that became a poignant memorial to a murdered skater.

A hands-off space for graffiti artists to hone and display their skills.

A tunnel with windows, so you don't miss out on the impressive views.

True to its name, this little house presents like a dollhouse, and surprising details are revealed with a quick peek through the window.

This striking Victorian Home with its 113-foot turret is best known as the site where abolitionist John Brown was executed in 1859.

Berkeley Springs State Park boasts the nation's only monument commemorating presidential bathing.

A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

Come for the speed, leave in love with the desert.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.