The loneliest island in New York.

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

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

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

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

A crumbling hospital from the 1850s on Roosevelt Island.

A terrific purveyor of natural history objects and curios.

This empty Victorian manse on Staten Island is said to be haunted but is actually a real life crime scene.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

A once grand hotel is being retaken by the wilderness it once capitalized on.

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

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.

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

Nikola Tesla's former home contains an homage hidden from plain sight.

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

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

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

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

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

An abandoned castle owned and ignored by Masons carries a cursed history.

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

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

Become a prohibition rebel.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.