"A hideous albatross in the Hudson River Valley."

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

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

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

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

A mysterious echo seems to defy the laws of acoustics.

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

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

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

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

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

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

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

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

An abandoned asylum once on the cutting edge of lobotomies may be reborn as a Christian college.

A Frankenstein blend of science and art allows one tree to produce 40 different types of stone fruit.

The library of every book lover's dreams.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

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

One man's swirling six-acre monument of stone.

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

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

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

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