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

Cheap pizza and all of your naughty bedroom needs housed in a stunning example of Art Nouveau architecture.

The loneliest island in New York.

A formerly abandoned mental institute, now back in business.

The oldest continuously operating farm in New York State.

The highest point on the island known for buildings that touch the sky.

There are owls with glowing eyes in Herald Square.

One of the oldest Jewish cemeteries in the city, it is now overgrown with an urban forest.

The mummified relics of an American missionary.

Abandoned power station once home to a squatter community, now being developed into an arts center.

A hip bar decorated with walls of golden skulls.

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

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

"A hideous albatross in the Hudson River Valley."

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

Outsider art or homage to aliens?

Despite not growing anywhere near New York City, bananas are ripened in a pressurized room in the Bronx using precise banana science.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

Connecticut grave of the woman responsible for the Winchester Mystery House in California.

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

A tiny islet just off Long Island offers a wealth of infectious curiosities.

Bonsai garden in Oakland is curated by the first non-Japanese female bonsai master in the United States.

Prove you deserve to be fed by Kenny Shopsin.

Guarded by the Angel of Grief, the Stanford family tomb attracts an odd mix of halloween revelry and somber contemplation.