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.
Hard to imagine this Lovers Bridge originated from a modern day Italian novel. Write your initials on a lock, attach it to the bridge, and toss the key in the Siene for everlasting love. My lock is there, if I can find it