New York “Parkitecture”: An abandoned elevated freight rail line on the Lower West Side has a new life as a one-of-a-kind elevated green space. The park winds from 34th Street near 12th Avenue to Gansevoort Street and Washington Street. (The northernmost extension opened in 2014.) You can enter at either end or at several stairways in between. Visit http://www.thehighline.org/ for more information.
Besides being an enjoyable destination unto itself, High Line is an excellent vantage point for spotting architectural landmarks of Chelsea, West Chelsea and Gansevoort Historic Districts.