One of the earliest bowling lanes in the U.S. doubled as a sewing school during a time when women had little job opportunity.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

Three-story slide through the New Museum.

One of the only single-person private gravesites in New York City.

This mysterious marker puzzles pedestrians and infuriates geographers.

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

A retired subway car stands alone in a field in the middle of Queens.

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

Need to book a room at the Hotel Pennsylvania? Just dial up 6-5000.

Historical figures from New York City's Catholic community reside in Midtown.

Waterway populated with abandoned projects, including a submarine.

A museum collection honoring the long history of the FDNY is held in a disused Manhattan fire house.

A posh members-only club with a literally dramatic history.

The last slot car racing arcade in Brooklyn is keeping the dream of speedy little autos alive.

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

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

Bowl in splendor, if you're lucky.

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

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

More gold than anywhere else, ever.

Become a prohibition rebel.

A semi-scholarly approach to sex.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.