Red frames showcase remnants of one of New York's original subway stations.

On the Hudson resides one of the largest clocks in the world.

New York City's smallest piece of private property.

Ride the subways of yesteryear.

Lie in a hammock where George Washington stood.

Tucked in the back of this amazing antique store is an important piece of medical history.

The oldest living tree in Manhattan comes shrouded in sinister legend.

Monument to a forgotten NYC disaster that claimed the lives of 1,000.

A reminder to choose water over wine since 1888.

One of the few remaining American elm trees in New York’s Tompkins Square Park was the birthplace of a new religion.

Down a stairway in the East Village, you could once read a plaque describing an alternate history of a fictional version of Manhattan.

This innocent-looking townhome is actually a subway exit.

A museum collection honoring the long history of the FDNY is held in a disused Manhattan fire house.

During the holidays, a vintage subway train whisks New Yorkers back in time.

A trove of century-old litho stones from the Puck Building's printing days were discovered behind a cellar wall, and are now hanging in the store.

Plot your trip through the city on the sidewalk.

A well-worn marker in a forgotten alleyway is all that remains of what had been one of Manhattan's most beautiful buildings.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

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

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

Unrepaired walls from a 1920 anarchist bomb attack.

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

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

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