Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

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

A Christian monastery stands on what was once a holy Incan temple.

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Experience what life was like in Ireland during the Viking and medieval ages.

This once-private estate is now a dreamy, meditative garden that's open to the public.

Its unique collection details the history of the state's svelte railroads.

The facade of this relic from the Klondike gold rush is decorated with over 8,800 pieces of driftwood.

The South's nickname was supposedly born at a former bank in New Orleans' French Quarter.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

Historic funicular railway, believed to be the shortest railroad in the world.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

Stand at the center of this lakefront sundial, and you'll become part of the timepiece.

The 44,000-ton aircraft carrier was purposely sunk to create an artificial reef teeming with life.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

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

It took 82 years and four different plaques to finally get the story right.

These colorful French islands spent a stint bootlegging booze during American Prohibition.

The mysterious canine hides atop a drain pipe on the back of the building, some say as a sneaky shoutout to Yale.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

These lush botanical gardens employ the most purrfect pest control force.