You might already heard about the Park-Extension Footbridge which is planned to be demolished soon. I think it can be preserved rather than being destroyed. Here are some of my designs I created during summer.
Visit this website for more information on the footbridge:
http://www.histoireparcextension.org/news-nouvelles/shpehs-speaks-out-prend-parole-structures-risk-2012
Proposal
Scene Footbridge
Alternative