The mark of the Devil's horns on a marble column in Milan.

This park on the outskirts of Rome boasts two ancient Roman aqueducts and a medieval tower.

A stunning bridge that appears as if it's lunging to the shore, and has a legend of a devilish architect.

This is the oldest Roman-made bridge in the city still existing in its original state.

A 1970s resort city now stands abandoned, caught in the middle of a divided island.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

During the heyday of fishing in Hastings, there were more than 100 of these storage facilities.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

The largest wildlife crossing in Utah allows local fauna to safely traverse the six-lane Interstate 80 at Parleys Canyon.

This quiet park's strange sedimentary spires were named after Kodak's color film.

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

Despite its name, this route in southern Utah offers a heavenly day trip.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The notorious Wild West outlaw was raised in this unassuming abode.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

The ruins of a town wiped out by the second-largest earthquake in recorded history.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

This awkward aquarium sculpture is one of the strangest statues in Chicago.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

An unlikely beach paradise of giant sand dunes lies between two lakes just a few minutes from Michigan's cherry country.

On the right bank of the Grand River a plaque remembers an imaginary painter who once awaited his youth.

Certain traditions prevail on the least-visited island of the Aran Islands.

This single room has survived the centuries with almost no deterioration.