Urban planning and neighborhood revitalization. The day-lighting of the river in the middle is my favorite! See dozens more, here.

Wow, check out the full gallery . The appeal of these designs is obvious. 

Of course the obvious question in some cases is a) how did people get to work and b) what was the economic impact of these changes? I’m generally supportive of removing cars but if people can’t get to work due to insufficient alternative means that is a problem in itself.