Once considered the height of medical modernity, this structure is now the oldest remaining component of Roosevelt Hospital.

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

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

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

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

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."

There are owls with glowing eyes in Herald Square.

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

The front yard of an Upper East Side town house hides the last fragment of one of New York's most famous theatres.

Possible relics of the ancient Roman city are hidden in this restaurant's façade.

Micro-distillery in Brooklyn produces New York’s first homemade rum since Prohibition.

Rat sculptures try to infiltrate the Graybar Building in an architectural tribute to New York City's nautical history.

A crumbling staircase in upper Manhattan is all that remains of one of the most important sites in sports history.

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

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

Play heads or tails with thousands of different coins.

Church in Manhattan holds the bloody sock of Padre Pio, among with many other unusual relics.

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.

A prohibition era watering hole for the police.

A museum collection honoring the long history of the FDNY is held in a disused Manhattan fire house.

In the back of a nondescript sports bar is a museum-worthy mural by legendary cartoonists.

Historical figures from New York City's Catholic community reside in Midtown.

The last remnants of what was once one of the world's grandest hotels can now be found in a Manhattan subway station.

Haven for steampunks.