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

Abandoned power station once home to a squatter community, now being developed into an arts center.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

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

Walk over a 150 year old manhole.

One of the last Jazz Age "Wonder Theaters" in New York City.

Unlock the secrets of the conjuring arts.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

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

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

From scholastic to sepulchral - now under reconstruction.

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

Peek through the gates at this oasis from the city, full of Old English charm.

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

A legendary speakeasy bookstore returns from the brink.

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

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

More gold than anywhere else, ever.

Become a prohibition rebel.

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