Peek through the gates at this oasis from the city, full of Old English charm.

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

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

A working metal shop and venue for outrageous art and music shows in a former cannonball factory.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

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

An unconventional space for art and science housed in a massive old warehouse.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

The origins of midtown Manhattan's anachronistic wooden farmhouse remain a mystery.

A living archive of urban activism and space reclaimed.

This abandoned factory on the Hudson River once churned out a million bricks a week.

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

"A hideous albatross in the Hudson River Valley."

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Two community gardens under the elevated subway lines on a very busy commercial strip in Bushwick.

100 massive sculptures in the Hudson River Valley.

Oldest existing wire suspension bridge in the United States.

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

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A curious friendship between two inanimate ladies.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.