Site of a famous 19th-century transcendentalist utopian community, now abandoned.

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

A beautiful Victorian-era cemetery, complete with a miniature village.

A notorious punk house turned co-op.

Salute the leader of the proletariat.

The site of the deadly Triangle Shirtwaist Factory Fire.

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

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

Two New York rooftops are home to the largest rooftop soil farms in the world.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

Thriving meadows span a rooftop in one of Brooklyn's most heavily industrialized neighborhoods.

A collection of fanzines, recordings, and documents detailing the rise and influence of the feminist punk movement.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

This iconic tattoo shop has its own onsite museum with artifacts from the early history of modern body art.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

Once America's longest-manned military fort, now an abandoned hulk.

This innocent-looking townhome is actually a subway exit.

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

A living archive of urban activism and space reclaimed.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.