Final resting place for the Triangle Shirtwaist fire’s unidentified victims.

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

Harlem park dedicated to compulsive hoarders killed by their own junk.

One of the oldest Jewish cemeteries in the city, it is now overgrown with an urban forest.

A way to take your secrets to someone else's grave.

19th century cemetery hidden in Brooklyn's Prospect Park.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

A hidden "place of interment for gentlemen."

This enormous Hindu temple in Queens serves incredible dosas in its basement canteen.

Visit the monolithic tomb of America's most famous general.

Once America's longest-manned military fort, now an abandoned hulk.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

The famous author's cottage hideaway.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

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

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.