The former hotel where Tesla invented the radio.

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.

Walk over a 150 year old manhole.

Plot your trip through the city on the sidewalk.

School named after its beloved principal, killed in the cross-fire of a drug related shooting.

A massive forgotten storehouse from 1913 on the Brooklyn Waterfront has a spectacular view of Brooklyn.

Once home to the country's most gargantuan ships, this graving dock now waits for people to buy furniture.

A Red Hook dive bar that is holding onto its roots.

A modern zoetrope on the New York City subway.

This vacant church in the Financial District was once the heart of New York's first Syrian immigrant community.

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.

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

Visit the site of a subway powered by nothing more than air--and lots of it.

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.

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

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

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

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

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.