New York City's smallest piece of private property.

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.'

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

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

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

The remains of what was once the world's steepest passenger funicular.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

A beautiful, historic location open to the public.

Thriving meadows span a rooftop in one of Brooklyn's most heavily industrialized neighborhoods.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

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

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.