An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

What was once a vast naval cemetery is now home to nesting birds and pollinating bees.

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

Lie in a hammock where George Washington stood.

Abandoned power station once home to a squatter community, now being developed into an arts center.

This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

This secluded ruin was once a home for exotic plants.

A tree that grows parallel to the ground was declared Brooklyn's "crowning curio" by the poet who saved it.

A hidden architectural treasure in New York's Brooklyn.

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

Compensation for the destruction of a historic shipyard.

A community farm in the midst of the Brooklyn concrete.

Enter the deli, walk until you hit the taxidermy, then order some hot, homey guisado.

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

Underneath the bustling city streets, a hydroponic farm grows unique herbs in an urban oasis.

A collection of playbills, photographs, and other memorabilia from the Brooklyn Academy of Music.

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

This hidden library of physiological ephemera contains centuries worth of knowledge on the vim and viscera of the human body.

New York's oldest and possibly grandest keeper of books.

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

A way to take your secrets to someone else's grave.

Fabrication workshop where the encasement for One World Trade Center's beacon was constructed.

A Collegiate Gothic quadrangle that surrounds an 18th century secondary school whose financing came from the likes of Alexander Hamilton and Aaron Burr, among others.