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

New York City's smallest piece of private property.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

The oldest living tree in Manhattan comes shrouded in sinister legend.

A quiet and contemplative oasis in the middle of New York's bustle and riot.

Salute the leader of the proletariat.

A terrific purveyor of natural history objects and curios.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

A trove of century-old litho stones from the Puck Building's printing days were discovered behind a cellar wall, and are now hanging in the store.

Walk over a 150 year old manhole.

Gang fights don't just happen on the streets, they happen under them too.

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

One kilometer of thick brass rod laid out before your eyes.

A hip bar decorated with walls of golden skulls.

Avoid gangster interaction while window-shopping.

Try not to get slimed in Tribeca.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

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

A partially hidden wall graffitied by spectators of the 1976 Bicentennial, recently rediscovered.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

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

Magnificent New Deal Murals evoke a time when New York City harbor was one of the world's greatest and busiest ports.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.