"A hideous albatross in the Hudson River Valley."

The 28-foot granite map plots the locations of 40 theaters in New York City.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

World's largest herd of white deer populate a former U.S. Army depot.

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

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

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

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

The real-life site of Ichabod Crane's infamous gourd attack.

This collection started by a Cornell professor once held more than 600 human brain specimens, including the one that belonged to its founder.

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

Little Red Lighthouse under the George Washington Bridge.

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

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

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

Toxic waste disaster that founded the Superfund program.

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.

One of the oldest Jewish cemeteries in the city, it is now overgrown with an urban forest.

The most confusing clock in New York.

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.

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

Town full of spiritualists, some of whom are mediums, is still in full swing after 130 years.

For over 80 years, Mayan ruins stood proudly in a most unlikely location.