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

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

Avoid gangster interaction while window-shopping.

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

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

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

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

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

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

Wine bottle sculpture with a ship's stateroom inside.

A charming "tea atelier" hidden away in Greenpoint, Brooklyn.

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

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

Once America's longest-manned military fort, now an abandoned hulk.

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

This enormous Hindu temple in Queens serves incredible dosas in its basement canteen.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

The famous author's cottage hideaway.

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.