This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Be(w)ar(e) the moat around this historic Czech castle.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

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

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

The childhood home of the Sultan of Swat is just a line drive away from Oriole Park at Camden Yards.

Perhaps the most scandalous statue of America's first president.

The first bell ever cast in Boston was cast by Paul Revere...and sounded terrible.

This candy-colored storybook village originated as a 19th-century Methodist campground.

Artifacts of whaling, with both its perils and adventure, are housed in this museum in a former candle factory.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

One part antique store, one part curiosities hodge-podge.

Campus tradition says couples who walk beneath this enormous oak will stay together forever.

Baroque celebration of the end of the Great Plague of Vienna.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

This futuristic German television spire is actually the world's largest digital clock.

This monumental Jesus is often referred to as "Our Milk Carton With Arms."

This century-old roadside attraction is full of bizarre rock formations.