An accidentally hidden library containing the ephemeral history of New York.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

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 world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

Visit the site of a subway powered by nothing more than air--and lots of it.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

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

Hear the tales of New York's most notorious criminals.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

A partially hidden wall graffitied by spectators of the 1976 Bicentennial, recently rediscovered.

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

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

Possible relics of the ancient Roman city are hidden in this restaurant's façade.

Ever wanted the laymen's version of your credit card fine print?

More gold than anywhere else, ever.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

The oldest Methodist church in the United States has been spreading the good news for over two centuries.

The last remnants of what was once one of the world's grandest hotels can now be found in a Manhattan subway station.

This Russian bar-restaurant lies within a three-story underground bathhouse.

The façade of this building looks like a bingo board, but it's really a giant clock by a famed graphic designer.

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.