Rows of dozens of trees, each one housing hundreds if not thousands of padlocks, adorn the banks of the Moscow River and symbolize a couple’s eternal love in marriage.

When a couple get married, they write their names on a padlock (which is often the shape of a heart), lock it to some free space on one of the metal tree frames, and toss the key into the river. Although the practice is common in many other countries, the iron trees that lovers affix their lock to make Moscow’s bridge of love a unique and romantic site.

It is not uncommon to see newlyweds on the bridge, and even brides in their wedding gowns, kissing just before clicking down their padlock of love on Luzhkov Bridge.