Near Vatican City

The trio of arches in the Tiber River's center has been basically unchanged since the Ponte Sant'Angelo was built around A.D. 135; the arches abutting the river's embankments were added late in the 19th century as part of a flood-control program. On December 19, 1450, so many pilgrims gathered on this bridge (which at the time was lined with wooden buildings) that about 200 of them were crushed to death.

Since the 1960s, the bridge has been reserved for pedestrians, who can stroll across and admire the statues designed by Bernini. On the southern end is Piazza Sant'Angelo, the site of one of the most famous executions of the Renaissance. In 1599, Beatrice Cenci and several members of her family were beheaded on orders of Pope Clement VIII. Their crime? Plotting the murder of their rich and brutal father. Their tale inspired a tragedy by Shelley and a novel by 19th-century Italian politician Francesco Guerrazzi.