If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

You must take the A train... to the last active cemetery in Manhattan.

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

One of the only single-person private gravesites in New York City.

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

The "Seinfeld" diner.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

An unassuming island in the middle of the Hudson that hosts campers, including Aleister Crowley.

This house was the subject of an Edward Hopper painting, which in turn helped inspire the design of the Bates house in Alfred Hitchcock's 'Psycho.'

Astonishing collection of helmets, scientific instruments, and medical models.

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