The oldest surviving synagogue in New York City is now a soaring art space.

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

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

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

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

New York City's smallest piece of private property.

Ride the subways of yesteryear.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

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

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

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

Elevated freight railway turned wildly successful urban park.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Try not to get slimed in Tribeca.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A crumbling hospital from the 1850s on Roosevelt Island.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A Boeing mechanic and his wife leave a whimsical, stone sculptured garden as their legacy.

This grand old 80-foot sequoia towers above the buildings in the city’s retail center.