I'm doing this when I get married. In Germany... Couples will take a lock, and attach it to the bridge's fence and throw the key into Rhine for love and good luck. So, all the way across the whole bridge the fence is covered in locks! I want to go to germany just to do this...
Romantics are declaring their feelings by attaching padlocks to landmarks all over the globe. The symbolic gesture is meant to represent “unbreakable love”, with couples showing their commitment by throwing away the key into the water. In London love padlocks are attached to various points along the fence on Tower Bridge.
This is a bridge in Paris. You hang locks on it with the name of you & your boyfriend/girlfriend/best-friend then throw the key into the river. So even though the friend/relationship may end, you cant remove the lock. It stays there forever, as relevance to someone once a part of your life.
LOVE the lock bridges!