Once the largest public hospital for the mentally ill was also surrounded by controversy.

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

Ornate and macabre headstone in one of the country's oldest cemeteries.

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

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

A beautiful, historic location open to the public.

This derelict building used to house infirm Freemasons, their widows, and orphans.

Hundreds of numbered stakes hidden in the woods mark the graves of the lost souls of a nearby asylum.

This former Norwegian sailor's church is slowly being taken over by ramshackle robot musicians.

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

A terrific purveyor of natural history objects and curios.

Nondescript elevator doors open to reveal a stunning, surreal world.

The "Seinfeld" diner.

This old-fashioned candy shop, ice cream parlor, and diner served as the setting for one of TV's most controversial series finales.

Seriously good slices of Sicilian pizza lurk at the back of the Bronx's oldest enclosed market.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

The real-life site of Ichabod Crane's infamous gourd attack.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

Revolutionary War casualties fill the only 17th century structure remaining in Manhattan.

The first neighborhood to implement the Garden City model in its suburban planning.

A Manhattan Episcopal church with an eerie underground crypt.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.