A Manhattan Episcopal church with an eerie underground crypt.

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

A curious friendship between two inanimate ladies.

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

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

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

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

A hidden "place of interment for gentlemen."

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

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

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

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

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

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

A terrific purveyor of natural history objects and curios.

The first and only carousel with a lineup entirely of insects.

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.

The famous author's cottage hideaway.

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

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

A hip bar decorated with walls of golden skulls.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.