Hundreds of antique bank vault locks on display in New York City.

An unassuming secret door once led to a legendary watering hole.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

NYC's legendary underground network for bovine transportation.

Cheap pizza and all of your naughty bedroom needs housed in a stunning example of Art Nouveau architecture.

A garment factory hides a small Dominican eatery in the hallway to its freight elevator.

Commemorating the spot where the famous scientist fed his pigeons.

This semi-hidden Manhattan restaurant is based out of a loading dock.

Where the legendary Orson Welles got his theatrical start before "Citizen Kane."

The former home of the reclusive "Weird Wendels" who dominated New York real estate a century before Donald Trump.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

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

This study room in the New York Public Library saw the creation of one of contemporary America's greatest traitors.

Rummage through this sunken ship, but leave your scuba gear at home.

The home of one of America's most beloved fictional characters has become a real world landmark.

Need to book a room at the Hotel Pennsylvania? Just dial up 6-5000.

This New York holdover was built to provide housing for shopgirls and still does not allow men above the lobby.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

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

Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

There are owls with glowing eyes in Herald Square.

New York's oldest magic store.