On one of our December hikes we walked along our favorite bridge and we noticed several more locks added to the bridge. The day was very grey, with a little bit of snow on the ground. I thought it made the locks looks extra special.
Typically the sweethearts' names or initials, and perhaps the date, are inscribed on the padlock, and its key is thrown away (often into a nearby river) to symbolize unbreakable love.
The tradition may have originated in Hungary after World War I, when a woman fixed padlocks on the bridges where she and her lover used to meet. It became popular in other parts of the world, including Paris, in the 2000s.
A wreath was placed on the bridge too.