The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

Try not to get slimed in Tribeca.

This preserved wilderness hides the remains of a colonial grain mill used to feed George Washington's troops.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

This two-room shotgun shack in Tupelo is the birthplace of a King.

A Beaux-Arts triumph set to become Ford's innovation campus

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

Rippling sand dunes frozen in the Arizona rock.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

Four-story concrete hotel never opened to customers.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

Enormous small-business mecca in the Midwest, serving dozens of artists.

Opulent downtown movie theater now houses cars as an indoor parking garage.

This sprawling bookstore spans four floors and has more than a million books in stock.

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

These mid-century motels once housed the workers who built the Glen Canyon Dam.

A geological mystery on Camelback Mountain.

A Wild West jailhouse that slid down the mountainside.

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

Once the product of an inexplicable gold strike, this ghost town is now home to one man and his love of classic machines.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.