It started in Rome, with young lovers affixing their initials to padlocks and securing them to the ancient Milvian Bridge, then tossing the key into the Tiber River. The practice has since spread to to other countries.
Germany Thousands of padlocks are fixed by lovers at a fence on a train bridge over the Rhine in Cologne, Germany. A German custom says that lovers will fix their love with the lock when they throw the key into the river Rhine. Martin Meissner/AP Buy Photo