Two thousand artifacts from around the world collected by one woman who loved to travel.

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.

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

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

Dr Barnes' $25 billion private collection of art and arboretum.

"A hideous albatross in the Hudson River Valley."

The headquarters of the famous Yale society.

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

100 massive sculptures in the Hudson River Valley.

An eccentric playboy's astounding natural history collection.

Legendary private island in the Bronx...devoid of rats.

The home of aviation trailblazers, in a remote corner of the big city.

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

Holding the most bodies of any cemetery in the United States.

Storage warehouse of the rich and famous.

A curious friendship between two inanimate ladies.

A modern addition to the Greenpoint skyline.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

Four cars from the old system were once on display, but were removed in 2014.

Where Greenpoint's first European settler—and troublemaker—made his home.

A massive forgotten storehouse from 1913 on the Brooklyn Waterfront has a spectacular view of Brooklyn.

Once a flowing stream and where the USS Monitor, the world's first ironclad, was built and launched.

A notorious punk house turned co-op.