One of the last Jazz Age "Wonder Theaters" in New York City.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

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

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

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

Become a prohibition rebel.

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

Try not to get slimed in Tribeca.

19th century cemetery hidden in Brooklyn's Prospect Park.

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

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

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

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

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

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

This small, hidden cove is home to abandoned boats.

A Ukrainian church canteen doles out hearty fare in an East Village basement.