Ponte Sant'Angelo, also known as Pons Aelius, is an ancient Roman bridge spanning the Tiber River. It was built in 134 AD by the Roman emperor Hadrian, connecting the city center with his new mausoleum. , that is, today's Castel Sant'Angelo. The bridge is paved with marble and has three bridge arches. This bridge is currently only for pedestrians walking. In the past, pilgrims passed this bridge to St. Peter's Basilica, so it is also known as the pons Sancti Petri. In the 6th century, the Pope, I named the castle and the bridge as "Sacred Angels". Legend has it that the archangel Michael was appearing on the roof of the castle, announcing the end of the Black Death. In the leap year of 1450, many people fell into the river and drowned because of the arrival of a large number of pilgrims. Therefore, the houses at the bridgehead and a Roman Arc de Triomphe were removed to widen the pilgrimage route.