Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

19th century cemetery hidden in Brooklyn's Prospect Park.

The highest rapid transit station in the world.

A working metal shop and venue for outrageous art and music shows in a former cannonball factory.

This interactive gallery makes you feel like you've stepped into a fantasy world filled with whimsical monsters.

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

This eclectic sculpture garden in Brooklyn, home to a bizarre collection of art, was once a run-down junkyard.

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

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

A waterway covered over after the Industrial Revolution has been unearthed and cleaned up, for the enjoyment of fish and humans alike.

A huge resale shop for the cast-offs of the film & television industry.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

This unusual apartment building may be Brooklyn's own version of the Leaning Tower of Pisa.

This secluded ruin was once a home for exotic plants.

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

Detailed facade of a brownstone in Boerum Hill.

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

A beautiful collection of architectural ornaments rescued from demolished New York City buildings.

This innocent-looking townhome is actually a subway exit.

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

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

Before online banking and smartphone apps, there was "commuter banking" in the subway in Downtown Brooklyn.

Love is in the air along the small street in Brooklyn.