This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

One Brooklyn man's collection of life-size fiberglass statues has taken over his entire yard.

Waterway populated with abandoned projects, including a submarine.

A former connection to City Island, it has been abandoned since the 1930s.

Eclectic architecture in the woods of New York.

See wolves, coyotes, and arctic foxes in a natural environment smack in the middle of New York State.

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

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

"A hideous albatross in the Hudson River Valley."

Toxic waste disaster that founded the Superfund program.

A sculptural commentary on capitalism pokes up from the East River.

This was one of the first (and last) university-built and operated nuclear reactors.

An abandoned 19th century quarry in the middle of the woods, remade by unnamed wanderers into a massive series of rock thrones.

A six-story treehouse offers spectacular views of New York's Finger Lakes region.

Underground vaults of a former brewery beneath Brooklyn's Crown Heights are now used to ripen cheese.

Historical figures from New York City's Catholic community reside in Midtown.

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

The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

Three acres of mythology-inspired sculptures are visible from the highway.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

The first "Hall of Fame" in America was designed by legendary Gilded Age architect Stanford White for what was then the NYU uptown campus.

Records of the dead describe the myriad odd ways people used to die.

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

More than 300,000 historical artifacts from the famous music venue, from Duke Ellington's handwritten score to The Beatles' booking slip.