This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

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

A modern zoetrope on the New York City subway.

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

Why have you never heard of the second most popular tourist site in New York?

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

100 massive sculptures in the Hudson River Valley.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

A curious friendship between two inanimate ladies.

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

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

The most confusing clock in New York.

Salute the leader of the proletariat.

Little Red Lighthouse under the George Washington Bridge.

Walk into the 19th century without leaving Brooklyn.

The site of the deadly Triangle Shirtwaist Factory Fire.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

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

Rummage through this sunken ship, but leave your scuba gear at home.

Nikola Tesla's former home contains an homage hidden from plain sight.

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.

This innocent-looking townhome is actually a subway exit.