A hidden "place of interment for gentlemen."

Site of the first pathological and bacteriological research facility in the United States.

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

Tucked in the back of this amazing antique store is an important piece of medical history.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

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

Elevated freight railway turned wildly successful urban park.

A celebration of capitalism in Midtown.

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

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

An artist's cute bronze subway sculptures belie his violent artistic past.

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

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

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.

A semi-scholarly approach to sex.

Commemorating the spot where the famous scientist fed his pigeons.

The former hotel where Tesla invented the radio.

There must be a pun in this haystack somewhere...

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

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

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