Behind a grungy bodega facade, a Poblano family serves rich, home-cooked meals.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

The first museum in the United States dedicated entirely to posters.

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

Finally, you don't have to be a pious Swedish seaman to relax like one.

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

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

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

This innocent-looking townhome is actually a subway exit.

New York's oldest and possibly grandest keeper of books.

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

This abandoned subway station can still be seen on regular commuter trips.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

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

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

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

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

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

Nondescript elevator doors open to reveal a stunning, surreal world.