A crumbling staircase in upper Manhattan is all that remains of one of the most important sites in sports history.

A basement pool hall is the front for some of the best Dominican food in New York City.

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

Surrounded by low rise buildings and partially converted into an auto body shop, this marble archway is the only vestige of a forgotten Manhattan estate.

This Dutch Colonial home is the oldest remaining farmhouse in Manhattan.

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

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 hip bar decorated with walls of golden skulls.

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

One of the city’s oldest watering holes was originally the home of a famous James Brown (not that one).

Manhattan's Thirteenth Avenue was made on landfill then deliberately destroyed — apart from one small, obscure block.

This historic building housed the surviving crew members of the Titanic, who were left destitute after the wreck.

Manhattan's deadly West Side railroad, which killed hundreds of New Yorkers, is remembered by this simple plaque.

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

This semi-hidden Manhattan restaurant is based out of a loading dock.

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

A hidden bar inside an ad agency has a deliberately misleading name, so employees can stay late under pretext of paperwork.

More than 300,000 historical artifacts from the famous music venue, from Duke Ellington's handwritten score to The Beatles' booking slip.

Slyly buy a shake in the Parker Meridien lobby.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

This lavish room at NYC's French Embassy is a rare relic from the end of the Gilded Age.

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

Peek through the gates at this oasis from the city, full of Old English charm.

This giant boulder is sandwiched between apartment complexes in upper Manhattan.