The gravestone of the suffragist leader attracted extra visitors during the 2016 election.

This stone gatehouse was once the entrance to a historic mountain resort, and it had a cameo in a cheesy cult horror movie.

The wooden octagon in which Huckleberry Finn and A Connecticut Yankee were born can still be visited in upstate New York.

The life of one of FDR's possible mistresses is preserved in her palatial Hudson Valley mansion.

This once-private estate is now a dreamy, meditative garden that's open to the public.

"Gnome Chomsky" was once the largest gnome in the world, but is now simply tall for his kind.

These mouldering mansion ruins remember a time when the Catskills were nothing but luxury.

Surprisingly aquamarine waters fill deep lakes formed at the end of the last ice age.

An old dining hall now serves up ghost stories for lusty locals.

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

A peaceful international sculpture garden in upstate New York.

This locally-famous crevasse in New York State is icy all year round.

Quite possibly the last cross all humans will ever see.

Eclectic architecture in the woods of New York.

Toxic waste disaster that founded the Superfund program.

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

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

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

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

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

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

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