castle sant angelo, bridge and river tiber in rome, italy

adriano aelian aelius ancient angelo antiquity architecture attractive beautiful black bridge building castel castle church churches city crossing cultural cylindrical dark darkness downtown hadrian historical history italy known large local marble mausoleum meaning monument monuments night obscurity old olden once panorama parco past peter pons ponte pope position religion religiosity religious river road roman rome saint sant santangelo sculptures sight sightseer tevere tiber tour tourism tourist tourists towering town travel trip usually visit visiting voyage walk walking water white