The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

Whale bones, scrimshaw, and sperm oil make up just a part of this comprehensive collection of whaling history.

An eccentric playboy's astounding natural history collection.

A millionaire's abandoned swimming pool from the gilded age of one of America's most distinguished families.

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

A formerly abandoned mental institute, now back in business.

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.

A historic lighthouse steeped in rumors of ghost and pirate stories.

The first commercial nuclear power plant constructed on Long Island.

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

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