Surrounded by low rise buildings and partially converted into an auto body shop, this marble archway is the only vestige of a forgotten Manhattan estate.

A heartbreaking monument showing the last morning in the life of Jane Griffith.

Obscure and obsolete publications are given new life as works of art.

Constructed in the 1920s, this former pencil factory is now an office building.

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

This translucent sculpture represents a quintessential component of New York City's skyline.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

The former home of the reclusive "Weird Wendels" who dominated New York real estate a century before Donald Trump.

Failed state-supported institution meant to rehabilitate students with intellectual disabilities.

A former connection to City Island, it has been abandoned since the 1930s.

The gilded vestiges of a sterling department store can still be found in a Brooklyn shopping center.

Once a popular watering hole among longshoremen and shipyard workers, this neighborhood treasure spans more than 100 years of Red Hook history.

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

Long-forgotten artifacts give incredible insight into New York's most glamorous hotel.

The Vatican of the movie industry turned into an actual church.

Offbeat arts organization that hosts exhibitions, events, and explorations.

During the 19th century, you could pay for violence off a prix fixe menu on this Manhattan street.

A way to take your secrets to someone else's grave.

Need to book a room at the Hotel Pennsylvania? Just dial up 6-5000.

The one-time epicenter of American songwriting is now a little remembered Manhattan commercial block.

The origins of midtown Manhattan's anachronistic wooden farmhouse remain a mystery.

A town trapped in time - 1958 to be exact.

This narrow shop in the East Village hosts a matchmaking service for the new millennium.