Pont des Arts Love Locks pedestrian bridge in Paris, walking distance from the Louvre. Write you and your loves name on the lock and throw the key in the river. Would love to do this some day when I go to Paris!
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...:p