This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

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

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

The "Seinfeld" diner.

From scholastic to sepulchral - now under reconstruction.

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

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

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

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.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

An unassuming secret door once led to a legendary watering hole.

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

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

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.

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

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

A celebration of capitalism in Midtown.

A legendary speakeasy bookstore returns from the brink.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

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

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