Dr Barnes' $25 billion private collection of art and arboretum.

The site of one of history's most indelible and horrific tragedies.

Final resting place of two dozen New York City harbor ships.

Self-sufficient greenhouse floating on the Hudson River.

The oldest continuously operating farm in New York State.

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

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Despite not growing anywhere near New York City, bananas are ripened in a pressurized room in the Bronx using precise banana science.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

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

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

2 square block factory in Greenpoint erected in 1936.

The mass grave of a heroic Revolutionary War regiment sits below an empty lot near the Gowanus Canal.

Once home to the country's most gargantuan ships, this graving dock now waits for people to buy furniture.

NYC's legendary underground network for bovine transportation.

Retribution for death of infamous mob boss Franie Yale was a case of mistaken identity.

Once a flowing stream and where the USS Monitor, the world's first ironclad, was built and launched.

Where infamous mobster and leader of Murder Inc. Albert Anastasia made his home.

The site where Joe Gallo kept his guns, pet lion, and launched an all out mob war in 1960s Brooklyn.

A decommissioned military complex that's now a modern industrial park.

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

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

Unrepaired walls from a 1920 anarchist bomb attack.

More gold than anywhere else, ever.