The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

The highest bridge in America was built for an almost unnervingly small amount of money.

Within the former ghost town of Cisco is a carefully restored tiny town with one resident and its own art residency.

The fifth-longest natural arch in the world, and the longest outside China.

An eclectic collection of artifacts from the Wild West is preserved in a remote fictional pioneer town.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

A legal loophole makes it possible to get away with murder within this 50-square-mile section of Yellowstone.

A singular collection of hand-built art deco cars are held in a building with style to match.

Wayne Newton's sprawling estate is now open for visitors to catch a glimpse of his "heart and soul."

Vintage cars and motorcycles race for glory in a throwback motorsport celebration on the Jersey shore.

It has an American Dream Car exhibit, Europe's largest Formula One collection, and many, many mannequins.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

Long-abandoned art nouveau baths beneath Milan's Piazza Oberdan.

This museum is rotten with a century of wax medical deformities.

Anatomical cabinet holds unexpected treasures.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

David Sedaris called it "The greatest shop in the world."

Go inside to really appreciate this 500-year-old technological masterpiece.

The oldest operating pharmacy in the world features 800-year-old recipes.

Fountain where visitors can earn a license to be mad.

A factory director designed what was the world's longest suspension footbridge in 1923 so his employees could get to work safely.

A gorgeous medieval library where the books are kept in chains.