A modern zoetrope on the New York City subway.

An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

There must be a pun in this haystack somewhere...

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

Relics given to a Manhattan church to avoid seizure by the Italian government.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Unrepaired walls from a 1920 anarchist bomb attack.

New York City's only preserved family home from the 19th century.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

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

An artist's cute bronze subway sculptures belie his violent artistic past.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

A bit of retro transportation flair preserved in the world's largest department store.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

This abandoned subway station can still be seen on regular commuter trips.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.