spoleto, perugia, umbria, italy: ancient the bridge aqueduct ponte delle torri (13th century) and the medieval fortress

spoleto umbria perugia italy fort fortress castle bridge landscape rocca albornoziana ponte delle torri medieval ancient old antique aqueduct view stronghold landmark ravine famous river mountain historical archaeology italian middle ages architecture building monument crossing hill hills city town historic tower romanesque roman cross nature green canyon arch forest travel apennines apennine mounatins