Two New York rooftops are home to the largest rooftop soil farms in the world.

The most unloved grain elevator in Brooklyn was a “Magnificent Mistake.”

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

The loneliest island in New York.

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.

Small monoliths of several varieties of stone sit alongside a wooded path in the Bronx.

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

An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

This whimsically unique butterfly farm focuses solely on creating habitats for the gentle insects.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

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

Protecting the future of some of the rarest and most misunderstood mammals of North America.

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

This forlorn park is the result of a failed investment turned tax dodge.

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

This sprawling woodland estate was the brainchild of iconic American industrial designer Russel Wright.

This abandoned cemetery is crumbling into ruin, exposing the artifacts and bodies buried there.

This abandoned factory on the Hudson River once churned out a million bricks a week.

100 massive sculptures in the Hudson River Valley.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

Reforestation in action is the main attraction in this abandoned quarry.

This abandoned ironworks was once the most important military supplier in America.