From scholastic to sepulchral - now under reconstruction.

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.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

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

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

A hands-on traveling collection of the innovative devices of yesteryear.

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

Mysterious 500-year-old tapestries depict a unicorn hunt.

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

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

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

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

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

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

A New York garbage depot holds a secret collection of weird and wonderful refuse.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

A semi-scholarly approach to sex.

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

Order scoops of pandan, lychee, and black sesame at this family-run institution.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

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

New York's oldest magic store.

Try not to get slimed in Tribeca.

Elevated freight railway turned wildly successful urban park.