Holding the most bodies of any cemetery in the United States.

Three-story slide through the New Museum.

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

A hidden "place of interment for gentlemen."

The former sign of this immortal music venue is just that--undying.

A terrific purveyor of natural history objects and curios.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

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

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

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

New York City's smallest piece of private property.

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

The notorious headquarters of a corrupt political machine.

An artist's cute bronze subway sculptures belie his violent artistic past.

A posh members-only club with a literally dramatic history.

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

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

A graffiti Mecca welcoming artists from around the world.

Harlem park dedicated to compulsive hoarders killed by their own junk.

Unlock the secrets of the conjuring arts.

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

Join in a Seance at the Swedenborgian Church.

A staggering collection of photographs depicting medical, social, and historical change.

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