Secluded amid upstate New York’s Adirondack Mountains lies this subterranean emblem of a nation on the brink of nuclear war. And it's for sale.

A mysterious air force base built to resemble a Long Island fishing village.

Set sail on a small scale.

This abandoned ironworks was once the most important military supplier in America.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

A six-story treehouse offers spectacular views of New York's Finger Lakes region.

A sewing machine tycoon built this miniature castle for the people and to beautify a lakeshore.

The great American road trip, but smaller.

A decommissioned military complex that's now a modern industrial park.

Micro-distillery in Brooklyn produces New York’s first homemade rum since Prohibition.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

This stone gatehouse was once the entrance to a historic mountain resort, and it had a cameo in a cheesy cult horror movie.

A town trapped in time - 1958 to be exact.

A perfect replica of the beloved show's first set.

A museum collection honoring the long history of the FDNY is held in a disused Manhattan fire house.

This Queens hospital has stood abandoned for almost 20 years after its patients were secretly relocated in the dead of night.

One kilometer of thick brass rod laid out before your eyes.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

This abandoned factory on the Hudson River once churned out a million bricks a week.

"A hideous albatross in the Hudson River Valley."

A winding, cliffside stretch of road overlooking the Delaware River.

This natural rock "church" might not be a proper chapel but that doesn't mean it's not beautiful.

Why have you never heard of the second most popular tourist site in New York?

An old abandoned mining town in The Adirondacks where Theodore Roosevelt first learned of the shooting of President William McKinley.