This beautiful building in the heart of Manhattan's Financial District was empty for decades.

Hidden behind a gate in Greenwich Village is a little farmhouse that once served as the writing studio of a bestselling author.

Gang fights don't just happen on the streets, they happen under them too.

Plot your trip through the city on the sidewalk.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

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

This slender three-story building has also had several famous residents.

A Ukrainian church canteen doles out hearty fare in an East Village basement.

One-time largest man-made structure in the world will be a park in 30 years.

A monument stands to the famous suffragist who penned the declaration for women's equal rights, including the right to vote.

A working monastery hidden away in Brooklyn once abutted the location of a former inebriate's home.

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

This secluded ruin was once a home for exotic plants.

A burial ground of rusting metal grave markers.

A retired subway car stands alone in a field in the middle of Queens.

This lavish room at NYC's French Embassy is a rare relic from the end of the Gilded Age.

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

Take in a rare, face-to-face glimpse of Lady Liberty at this tucked away Red Hook park.

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

Nature and beauty amidst pollution and industrial wreckage.

This Dutch Colonial home is the oldest remaining farmhouse in Manhattan.