Paris: A couple writes their names on a padlock and locks it onto one of the bridges (Pont des Arts or the Pont de l'Archevêché. They then throw the key into the Seine River as a symbol of their undying love.
Attach a lock onto the 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!
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