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

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

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

Series of storm drains connected to a dark urban legend.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

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

A beautiful, historic location open to the public.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

This abandoned cemetery is crumbling into ruin, exposing the artifacts and bodies buried there.

The remains of what was once the world's steepest passenger funicular.

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

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

Home to the abandoned Tioronda Hat Works Factory, this park is a combination of woodlands and marshlands.

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

At this site, two historic stone bridges spanning the Sing Sing Kill—one right on top of the other.

Along the Palisades skyline are the ruins of a large mansion built in 1911 and demolished in the 1930s.

This derelict building used to house infirm Freemasons, their widows, and orphans.