Spies, love letters, and ghost stories have all left their mark on this home-cum-museum.

Some of the earliest burial grounds of New York State are to be found hidden away in this quaint town.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

The site of a tragic massacre that spawned a multimedia franchise.

Time travel back to the 19th century and catch an old-timey baseball game at a 209-acre recreated village.

The famed poet was born in 1819 in a farmhouse built by his father.

The poet Walt Whitman was a frequent visitor to this spot, the highest on Long Island.

Now a retreat center for the faithful, it once provided training for clergy—but it began as a farm owned by a famed financier and his opera singer wife, who built a surprise in the backyard.

This graceful little figure is a one-of-a-kind version of the cherished character.

A museum that houses a collection of stenography machines plus dozens of books, photographs, and guides to shorthand languages from around the world.

A hospital that became a college, was abandoned again, and finally became a gated community.

A formerly abandoned mental institute, now back in business.

This forgotten graveyard in rural New York State once served a pioneering hospital.

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

Once the site of seances, this restaurant is said to be haunted by several ghosts.

A restored Shell gas station from 1937 that includes a tow truck, the original gas pumps, and the original office.

The second-largest (of only two in the world) large particle collider is the underdog of experimental physics.

Starting in 1961, Brookhaven National Labs regularly irradiated a section of forest with a canister of Cesium-137 to study the effects of hard gamma radiation on an ecosystem.

The first commercial nuclear power plant constructed on Long Island.

This house was used by the FBI to broadcast disinformation to the Nazis during World War II.

A tribute to the hard-working men and women of Grumman, who crafted F-14 fighter jets.

This cemetery holds the remains of an accused witch and the man that ensured her freedom.

This 19th-century Hamptons windmill was once home to modernist painter Agnes Pelton.

This century-old independent movie theater with an iconic Art Deco neon sign survived a devastating fire in 2016.