A decommissioned military complex that's now a modern industrial park.

The life of one of FDR's possible mistresses is preserved in her palatial Hudson Valley mansion.

During the holidays, a vintage subway train whisks New Yorkers back in time.

Walk into the 19th century without leaving Brooklyn.

One of the last Jazz Age "Wonder Theaters" in New York City.

The site of the deadly Triangle Shirtwaist Factory Fire.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

The Hudson River School comes alive at this palatial estate.

A whimsical, but often overlooked clock in Park Avenue.

A modern zoetrope on the New York City subway.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

"A hideous albatross in the Hudson River Valley."

Why have you never heard of the second most popular tourist site in New York?

The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

Cryptic messages embedded in the New York City sidewalk.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

Ride the subways of yesteryear.

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

A large camera obscura, constructed entirely from digitally fabricated components.

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

The largest body of water in Massachusetts annihilated four small towns just to slake Boston's thirst.

Books you don’t need in a place you can’t find.

This tall Massachusetts folly got its name thanks to all of the purple prose its vistas inspired.