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

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

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

A once crucial portion of the Long Island railroad still lays abandoned, waiting to be turned into an urban park.

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

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

A mysterious, abandoned building rotting on the Brooklyn waterfront.

This small, hidden cove is home to abandoned boats.