This private island is still in the family after a 400-year history including a witch hunt and a pirate.

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

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

A tiny islet just off Long Island offers a wealth of infectious curiosities.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

This once luxurious Catskills resort is now a haunting ruin.

Ruins of a historic medical facility sits eerily by the water.

Haunted Victorian house that inspired a legendary "Ghostbusters" court ruling.

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

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.

The real-life site of Ichabod Crane's infamous gourd attack.

Underground tunnels remain beneath this abandoned mental asylum.

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

A vast collection of rare books, manuscripts & extraordinary objects illustrating the history of medicine.

An archival collection of over 2,200 case studies which includes human brain specimens and tumor specimens.

Connecticut grave of the woman responsible for the Winchester Mystery House in California.

The headquarters of the famous Yale society.

Panoramic views of the city of New Haven and the Long Island Sound, with a side of history.

American artist J. Alden Weir purchased this 60-acre estate for $10 and a painting.

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

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

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

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

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