Red frames showcase remnants of one of New York's original subway stations.

A collaborative art project that transformed a neighborhood in NYC's Queens.

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

Salute the leader of the proletariat.

The notorious headquarters of a corrupt political machine.

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

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

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

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

One of only two commuter aerial tramways in the United States.

A semi-scholarly approach to sex.

Try not to get slimed in Tribeca.

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

The cave where two British judges hid in exile after sentencing the king to death.

This mesmerizing kinetic sculpture blossoms endlessly in the breeze.

An Irish Memorial commemorating those who perished due to potato blight.

Yo, Adrian!

The world’s first penitentiary, meant to be humane, drove men insane.

An unassuming stone building houses New York City's oldest seismic station almost 30 feet below the Bronx.

This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

A small graveyard is hidden in the midst of a bustling university campus.

Tucked away amidst some of the most famous addresses in the world is New York’s only fraction of a street.

Commemorating the spot where the famous scientist fed his pigeons.

The most confusing clock in New York.