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

The only remaining building in New York to see the inauguration of a president is being slowly overtaken by a grocery store.

Nope, not Washington Irving's house.

The artist and New York City icon lived, worked and died in this converted carriage house owned by another iconic artist, Andy Warhol.

These historic buildings once housed the headquarters of one of the most infamous gangs of New York.

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

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.

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

This memorial honors thousands of enslaved Africans and their descendants who died in colonial New York.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

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

Revolutionary War casualties fill the only 17th century structure remaining in Manhattan.

This humble historic facade hides a history of boozing and the gentlemanly sport of rat-fighting.

Avoid gangster interaction while window-shopping.

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

The façade of this building looks like a bingo board, but it's really a giant clock by a famed graphic designer.

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

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

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

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

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

Unrepaired walls from a 1920 anarchist bomb attack.