Love Lock Bridge, Paris---I was just there! and what a stunning view from the bridge! The lock idea is really interesting too, and the story that goes with them :) Even if it's not good for the bridge.
A Trampoline Bridge in Paris Made of inflatable tubing and three giant interconnected trampolines, designed by AZC Architecture Studio. It would provide a newer and more playful path in the form of an inflatable bridge equipped with giant.