Castel Sant'Angelo from the Aelian bridge in Rome, tourists cross bridge from Mausoleum of Hadrian

castel sant angelo castel santangelo ponte sant angelo vatican mausoleum of hadrian tiber italy fortress castel tourist attraction castle angelo roman pons aelius sightseeing tourism hadrian monument statue mausoleum landmark tourist architecture view bridge building travel old town historical history landscape scenic urban archangel cross people angel culture religion aelian famous static