The "possessed" house that inspired "The Haunting in Connecticut" book and movie.

The graves of a Connecticut family thought to have been plagued by a vampire.

A 60-room castle constructed by a horse-racing heir.

This Rhode Island mansion was a stand-in for the exteriors of Collinwood in the original "Dark Shadows" series.

Eco-friendly island mansion.

This small-town pizzeria won the Hollywood lottery.

The kind of mixed-up place that drives archaeologists crazy.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

Underground tunnels remain beneath this abandoned mental asylum.

Want to build a wind turbine? Secede from the nation.

The Connecticut village named for its subterranean thunder.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

A mysterious air force base built to resemble a Long Island fishing village.

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

An unrealized dream to wirelessly electrify the entire Earth.

A formerly abandoned mental institute, now back in business.

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

An eccentric playboy's astounding natural history collection.

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

This outpost of America's most popular fast-food restaurant is housed inside a palatial mansion.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

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

The oldest continuously operating farm in New York State.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.