This once luxurious Catskills resort is now a haunting ruin.

A historic lighthouse steeped in rumors of ghost and pirate stories.

A man used his Civil War-era fortune to build this sanctuary in memory of his wife.

The shared home of a utopian commune that practiced "free love" a century before the hippies.

A nearly 100-year-old dining car in upstate New York embodies the golden age of roadside dining.

A distillery built on (and above!) mobster Dutch Schultz's Prohibition-era underground moonshine business.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

A mysterious air force base built to resemble a Long Island fishing village.

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

This abandoned ironworks was once the most important military supplier in America.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

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

This throwback amusement park is home to rides and unique storybook figures from the past.

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

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

A forsaken wonder in the middle of the East Side neighborhood.

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

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

Waterway populated with abandoned projects, including a submarine.

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

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

A beautifully designed asylum was resurrected as a hotel and art center with a ghost story or two.

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

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