Ponte Milvio

A strategically vital bridge built in 115 BC, where Constantine defeated his rival Maxentius at the Battle of the Milvian Bridge in 312 AD — the battle that led to Christianity's adoption as the Roman Empire's state religion. Maxentius drowned in the river when his retreating troops broke a temporary pontoon bridge. In recent decades, the bridge became famous for the 'love padlock' tradition popularised by Federico Moccia's 2006 novel Ho voglia di te — though the city now removes them periodically.