In the 1980s, in the Hungarian city of Pécs, lovers began to clamp padlocks to this wrought-iron fence as a symbol of their commitment.

Now that the fence has filled up, people have begun attaching locks to fences and statues throughout the town center, and the custom has spread to Hungary, Latvia, Italy and Japan.

“Love is a lock that linketh noble minds,” wrote Robert Greene, “faith is the key that shuts the spring of love.”