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

The loneliest island in New York.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

The famous author's cottage hideaway.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

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

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

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

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.

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

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

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

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

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

Unique antiquarian shop specializing in globes, maps, and prints.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

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

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

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

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

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

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