This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

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

Why have you never heard of the second most popular tourist site in New York?

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

This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.

A mysterious echo seems to defy the laws of acoustics.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

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

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

This Central New York ghost town was once a prosperous railroad community.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

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

What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

The site of a tragic massacre that spawned a multimedia franchise.

The absurd creation is a compulsory destination for selfies in Buffalo.

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

An oasis of calm amid the chaos of the boardwalk, the museum traces the heritage of this beloved beachside amusement park.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A popular European tradition makes its way to the states on one of America's most famous bridges.

A once grand hotel is being retaken by the wilderness it once capitalized on.