Look around any Rust Belt city and you can see the effects of urban decay. There's aging infrastructure, blighted buildings and abandoned homes. Even as cities begin to see a resurgence, it can be hard to shake the physical legacy of decades of decline.
But if you think post-industrial decay is hard to overcome, try something even more traumatic, like a dictatorship or, say, World War II. Some European cities have found a way to revive public spaces and re-engage the community in civic life, all while remediating the physical toll left by history.