A very classy 1920s-era bar right in Grand Central Station.

Walk over a 150 year old manhole.

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

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

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

The oldest surviving synagogue in New York City is now a soaring art space.

Unlock the secrets of the conjuring arts.

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

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

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

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

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

An unassuming secret door once led to a legendary watering hole.

A legendary speakeasy bookstore returns from the brink.

Mysterious 500-year-old tapestries depict a unicorn hunt.

A celebration of capitalism in Midtown.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

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

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

A New York garbage depot holds a secret collection of weird and wonderful refuse.