This outpost of America's most popular fast-food restaurant is housed inside a palatial mansion.

One of the few remaining American elm trees in New York’s Tompkins Square Park was the birthplace of a new religion.

A winding, cliffside stretch of road overlooking the Delaware River.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

"A hideous albatross in the Hudson River Valley."

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

This natural rock "church" might not be a proper chapel but that doesn't mean it's not beautiful.

Thriving meadows span a rooftop in one of Brooklyn's most heavily industrialized neighborhoods.

An old abandoned mining town in The Adirondacks where Theodore Roosevelt first learned of the shooting of President William McKinley.

A castle built for love, and abandoned due to heartbreak.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

Salute the leader of the proletariat.

Come for the sustainable organic chocolate, stay for the sustainable organic booze.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

A deteriorating 1990s Girl Scout camp in a beautiful lush park on Lake Ontario.

A charming "tea atelier" hidden away in Greenpoint, Brooklyn.

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

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

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.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

This enormous Hindu temple in Queens serves incredible dosas in its basement canteen.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

The famous author's cottage hideaway.