An unconventional space for art and science housed in a massive old warehouse.

The Underground Railroad passed right through this historic Brooklyn Heights church.

The gilded vestiges of a sterling department store can still be found in a Brooklyn shopping center.

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

Waterway populated with abandoned projects, including a submarine.

An oasis of calm amid the chaos of the boardwalk, the museum traces the heritage of this beloved beachside amusement park.

One of only two remaining Victorian-era greenhouses in New York.

Toxic waste disaster that founded the Superfund program.

A once crucial portion of the Long Island railroad still lays abandoned, waiting to be turned into an urban park.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

An eccentric playboy's astounding natural history collection.

More than 300,000 historical artifacts from the famous music venue, from Duke Ellington's handwritten score to The Beatles' booking slip.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

An abandoned asylum once on the cutting edge of lobotomies may be reborn as a Christian college.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

A castle built for love, and abandoned due to heartbreak.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

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

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

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

The library of every book lover's dreams.

This innocent-looking townhome is actually a subway exit.