Here is an inspiring initiative out of NYC
http://www.thehighline.
The High Line is a 1.45-mile-long elevated rail structure on Manhattan’s West Side. It was built in the 1930s to remove dangerous trains from Manhattan’s streets. No trains have run on it since 1980. Friends of the High Line formed in 1999 when the historic structure was under threat of demolition. FHL’s mission is to preserve the structure for reuse as an elevated public open space.
