Köln
There are 3 arches to the bridge and in each section there are 100 sections. Love locks are on both sides and in each section there are, as a conservative estimate, 900 love padlocks.
A rough calculation comes up with 630,000 padlocks!! If each padlock weighs an average of 75g then the total weight of all the padlocks is 47.4 tons! That’s 2/3 the weight of the space shuttle.