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

Some of New York's best tacos can be found in the back of an unassuming bodega in Queens.

This elaborate tunnel is the first structure composed of cast concrete in the United States.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

Residents of this Brooklyn neighborhood may be unaware their houses sit atop a buried trolley graveyard.

Come for the pastrami, stay for the million-dollar art.

This preserved wilderness hides the remains of a colonial grain mill used to feed George Washington's troops.

The home of aviation trailblazers, in a remote corner of the big city.

This Queens hospital has stood abandoned for almost 20 years after its patients were secretly relocated in the dead of night.

A former seaside jewel built for the everyman is now simply a neglected art deco fortress.

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

Nine nice parcels of land along a flight path offer a quiet respite... until a plane soars overhead.

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

An everyday Jackson Heights bodega conceals a Mexican seafood paradise.

Chefs from Tibet's Kham region offer steaming meat pies and noodle soups in this nook behind a jewelry store.

A bronze plaque at an intersection in Hoboken marks the place where the game of baseball first took shape.

Where the four original members of the Ramones hung out and revolutionized punk rock.

No monkeying around, this fountain was really named after the classic sci-fi film.

This beautiful Brooklyn monument over a crypt memorializes a grim and largely unknown story from the American Revolution.

Now the site of a high school, this was almost the location of the largest cathedral in the US.

An illegally built ramshackle mansion tucked in the middle of Brooklyn is now being turned into condominiums.

A long abandoned hospital building on the outskirts of NYC.

The oldest living organism in New York City. Maybe.