#2 The High Line in New York

The High Line is a 1.45-mile-long New York City linear park built in Manhattan on an elevated section of a disused New York Central Railroad spur called the West Side Line. 

This was a revitalization project conducted by Friends of the High Line founded by Joshua David and Robert Hammond. It is a non-profit public private partnership with the New York City Department of Parks & Recreation. Friends of the High Line virtually funded all the High Lines Operations by raising contributions, and working with the city to ensure maintenance as a great public space for all.