Underground vaults of a former brewery beneath Brooklyn's Crown Heights are now used to ripen cheese.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

Home on the Hillside, and home of the first breakfast cereal.

This once luxurious Catskills resort is now a haunting ruin.

This mouldering abandoned mental hospital was once a center for progressive healing.

A long abandoned hospital building on the outskirts of NYC.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

The last slot car racing arcade in Brooklyn is keeping the dream of speedy little autos alive.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

An abandoned asylum where patients have been forgotten but their possessions remain.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

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

Original factory of John G. Borden who started what we know today known as Borden Dairy.

A former infectious disease laboratory chronicles how tuberculosis shaped a village nestled in the Adirondacks.

This historic fort spans more the 300 years.

Explore an enormous collection of original Americana tucked away in a small hamlet.

This museum dedicated to the history of the medical bone trade and human osteology.

The graphite created here was used in the manufacturing of pencils.

This diesel train serviced the Brooklyn waterfront for more than three decades.

This museum-within-a-museum pays tribute to "The World's Most Experienced Airline."

The remnants of a luxurious resort that saw its peak in the 1970s and 1980s has been abandoned since 2009, leaving behind the wreckage of both the hotel and a beautiful ice skating rink.

The Catskills retreat of naturalist writer John Burroughs.