A real flying saucer, contracted by the U.S. Air Force.

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

One of corporate America's best-kept secrets is also one of the most publicly displayed.

Ecuador’s historic seat of government has been quietly looted in recent decades, and no one knows how or by whom.

This huge green space packed with activities will make you forget you're in the middle of the Ecuadorian capital.

This 12-inch-tall wooden sculpture of a winged Virgin Mary has inspired much devotion and countless replicas.

Deep into the lower floors of Pike Place, find a date with fowl fate.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

A bit of retro transportation flair preserved in the world's largest department store.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

One of only two commuter aerial tramways in the United States.

Ride the subways of yesteryear.

Elevated freight railway turned wildly successful urban park.

Small church built in the 19th century for whites and slaves to worship together.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

See massive fossils that are over 200 million years old in northeastern Arizona.

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

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

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.