A six-story treehouse offers spectacular views of New York's Finger Lakes region.

The library of every book lover's dreams.

An abandoned castle owned and ignored by Masons carries a cursed history.

At this small shop off a dirt road in the forest, the specialty is eel the owner caught and smoked himself.

A gazebo that inspired the fifth episode of the "Twilight Zone" still stands in the creator's hometown

See wolves, coyotes, and arctic foxes in a natural environment smack in the middle of New York State.

Alexander Milliner, a favorite of General Washington, is interred at Mt. Hope Cemetery along with 80 other Revolutionary War veterans.

An abandoned asylum where patients have been forgotten but their possessions remain.

This collection started by a Cornell professor once held more than 600 human brain specimens, including the one that belonged to its founder.

The largest collection of historic military firearms in the United States.

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

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

This abandoned neighborhood is now a park filled with beautiful trees, wildflowers, and hints of its past.

Forgotten under the construction of a new urban roadway is a small, abandoned part of town.

Underground tunnels remain beneath this abandoned mental asylum.

The self-proclaimed world's smallest museum, located next to a Massachusetts sandwich chain.

This massive World War II calculator hearkens back to the days when "computer" was a job title.

Three prestigious academic collections come together to create a world-class natural history museum.

This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

A New Hampshire grave with a grudge.

An abandoned 146-acre summer resort slowly being reclaimed by nature.

The headquarters of the famous Yale society.

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

A winding, cliffside stretch of road overlooking the Delaware River.