This abandoned psychiatric hospital once housed more than 4,000 patients in the middle of a quaint New England town.

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

Glacial erratic or man-made dolmen? It probably wasn't druids.

Stay at this storybook estate, featuring Sir Henry Hudson Kitson's masterpiece "Gingerbread House."

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

The site of the first "historically true" UFO encounter in the U.S.

This natural rock "church" might not be a proper chapel but that doesn't mean it's not beautiful.

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

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

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

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

A once grand hotel is being retaken by the wilderness it once capitalized on.

This stone gatehouse was once the entrance to a historic mountain resort, and it had a cameo in a cheesy cult horror movie.

The largest known open fault in the United States is basically a giant natural refrigerator.

These mouldering mansion ruins remember a time when the Catskills were nothing but luxury.

The lost town of Neversink, sunk by New York City.

This Central New York ghost town was once a prosperous railroad community.

This once sprawling resort now sits abandoned, filled with graffiti and vibrant colors from an era long passed.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A crumbling hospital from the 1850s on Roosevelt Island.

Where the four original members of the Ramones hung out and revolutionized punk rock.

A mysterious statue of a leather jacket-clad rebel leans coolly on an odd yellow clock.

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

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.