ponte cestio from ponte emilio over river tiber and weir, rome, italy

ponte cestio emilio river tiber weir rome italy ancient bridges roman engineering tiber island isola tiberina historic landmarks history medieval bridge empire architectural heritage lungotevere stone ruins crossing bridge restoration flood control riverbank walk iconic aqueducts architecture arches cityscape views historical sites urban landscape civilization riverfront relics engineering marvels tourism scenic walks renaissance italian culture preservation infrastructure water management cultural archaeological city crossing antiquity monuments tourist attraction