Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

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

The famous author's cottage hideaway.

Nikola Tesla's former home contains an homage hidden from plain sight.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Bowl in splendor, if you're lucky.

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

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

Nondescript elevator doors open to reveal a stunning, surreal world.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

Read a book next to a Midtown waterfall.

A hands-on traveling collection of the innovative devices of yesteryear.

A dilapidated dock tells the story of Titanic's missed arrival.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.