The library of every book lover's dreams.

Hear the tales of New York's most notorious criminals.

New York City's only preserved family home from the 19th century.

New York City's only radical feminist independent bookstore.

The site of a tragic massacre that spawned a multimedia franchise.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

Have a steam and some blini at this cafe in a century-old bathhouse.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

Avoid gangster interaction while window-shopping.

An annual extravaganza of Broadway theater memorabilia.

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

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

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

Historical figures from New York City's Catholic community reside in Midtown.

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

The factory for the popular Dumbo location, the Greenpoint shop is a quiet gem.

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

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

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

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.

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

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.