One of only two remaining Victorian-era greenhouses in New York.

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

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

A curious friendship between two inanimate ladies.

A once crucial portion of the Long Island railroad still lays abandoned, waiting to be turned into an urban park.

An arcade packed with a rotating collection of unique independent video games.

Check out the underground party scene at the "Burning Man of Brooklyn."

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.

Unrepaired walls from a 1920 anarchist bomb attack.

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

A whimsical, but often overlooked clock in Park Avenue.

The former hotel where Tesla invented the radio.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

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

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

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

Visit the monolithic tomb of America's most famous general.

Volunteer-run library dedicated to exploring five decades of activism history.

A hidden "place of interment for gentlemen."

This enormous Hindu temple in Queens serves incredible dosas in its basement canteen.

Obscure and obsolete publications are given new life as works of art.

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

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.