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.

A natural gas leak provides a flickering flame beneath a waterfall.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

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

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

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

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

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

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

A celebration of capitalism in Midtown.

The "Seinfeld" diner.

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

A legendary speakeasy bookstore returns from the brink.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

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

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

New York City's smallest piece of private property.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A dilapidated dock tells the story of Titanic's missed arrival.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

A hands-on traveling collection of the innovative devices of yesteryear.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.