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

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

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

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

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

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

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

A celebration of capitalism in Midtown.

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

More gold than anywhere else, ever.

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

New York City's smallest piece of private property.

Read a book next to a Midtown waterfall.

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

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

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

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

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 treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

A terrific purveyor of natural history objects and curios.

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