Castel Sant'AngeloCastel Sant'Angelo

Castel Sant'Angelo began as Emperor Hadrian’s mausoleum (AD 123–139), a monumental tomb set beside the Tiber that later hardened into one of Rome’s key defensive bastions. Reworked by medieval and Renaissance popes and linked to the Vatican by the Passetto, it became a fortress, prison, and last refuge in moments of siege. Its name recalls the 590 vision of the Archangel Michael ending a plague, folding imperial memory, papal authority, and sacred protection into a single, enduring skyline form.