Cityscape of Rome featuring the Mausoleum of Hadrian (Castel Sant'Angelo) (Castle of the Holy Angel), a towering rotunda (cylindrical building) in Parco Adriano, UNESCO World Heritage Site, Rome, Italy, Europe

castel sant'angelo tiber river rome italy bridge stone bridge architecture historical landmark river water reflection sky sunny day cityscape travel tourism vacation landmark monument historic site castle fort defense fortification buildings urban city ancient medieval history culture european roman empire historic heritage travel destination sightseeing famous icon popular tourist attraction explore visit view panorama landscape scenery daytime outdoor outside