This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

A collection of fanzines, recordings, and documents detailing the rise and influence of the feminist punk movement.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

Avoid gangster interaction while window-shopping.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

This hidden library of physiological ephemera contains centuries worth of knowledge on the vim and viscera of the human body.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

Plot your trip through the city on the sidewalk.

This iconic tattoo shop has its own onsite museum with artifacts from the early history of modern body art.

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

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

Volunteer-run library dedicated to exploring five decades of activism history.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

An oasis of calm amid the chaos of the boardwalk, the museum traces the heritage of this beloved beachside amusement park.

This collection of grinning ephemera has grown from basement to Brooklyn.

Prove you deserve to be fed by Kenny Shopsin.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

New York's oldest and possibly grandest keeper of books.

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

Lie in a hammock where George Washington stood.

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.