I found this in Lisbon last year. Many people set up a small metal heart and hung it on the grids. It’s a variant of the love-locks mounted on so many bridges. On every trip I do, I find places with these locks labeled with names and dates. I’s always interesting to see how old some locks are or what kind of lock the couple has chosen to symbolize their (hopefully eternal) love. For those of you, not familiar with the idea of love-locks, jump to this post on Pont de l’Archevêché in Paris, where I explained the idea.
I already posted many of these love-locks. Unfortunately I forgot to label them all correctly or included the images in regular posts. But you can find many of them by following the tag lovelock.