An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

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

Little Red Lighthouse under the George Washington Bridge.

Collect holy water from a Bronx grotto.

The loneliest island in New York.

The famous author's cottage hideaway.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

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

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

A once grand hotel is being retaken by the wilderness it once capitalized on.

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

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