A former seaside jewel built for the everyman is now simply a neglected art deco fortress.

This Dutch Colonial home is the oldest remaining farmhouse in Manhattan.

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

Surprisingly aquamarine waters fill deep lakes formed at the end of the last ice age.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

Salute the leader of the proletariat.

Little Red Lighthouse under the George Washington Bridge.

The notorious headquarters of a corrupt political machine.

The library of every book lover's dreams.

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

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

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

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