Collapsing castle on the Hudson river was once the storage site of military surplus business.

An abandoned Victorian-era mill in the middle of modern Manchester.

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.

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

An overgrown and abandoned tuberculosis ward resides in the midst of a quaint modern neighborhood.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

This decrepit abandoned building is made all the more eerie by its dark history.

This sprawling art park is filled with sculptures, nature trails, and art workshops.

A famed data visualizer's personal sculpture garden is a landscape of modern and megalithic wonders.

Books you don’t need in a place you can’t find.

The mighty room where the poet spent most of her life is available to rent for an hour or two.

A former copper mine which became a truly unsuccessful prison.

Who knew the Devil's domain was a hot spot for tubing?

The building that inspired Shirley Jackson's "The Haunting of Hill House."

This small Catskills village has six independent bookstores and more bookshops than restaurants.

The former home of a disgraced local priest now hosts a mysterious secret supper club.

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

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

A stunning garden filled with fantastical environmental folk art and sculptures.

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

This once-private estate is now a dreamy, meditative garden that's open to the public.

What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

An abandoned dollhouse factory.