The New York Times has a great set of photos of the conversion of the High Line rail route in New York into an urban park. Not a lot of progress to see yet, but still beautiful shots. I mean, I’m sure that there’s been a lot of work done, but not many trees and other green stuff yet. I know that it’s probably 80% preparation, though.
Speaking of great urban parks, if anyone is ever in the East End of London they should visit Mile End park and do a walk along its length. The Green Bridge near the Northern end is a fantastic way for a pedestrian to cross the busy Mile End Road beneath.