the bell tower of st peter collegiate church with hohensalzburg fortress festung hohensalzburg at the background, salzburg, aust

abbey altstadt archabbey architecture attraction austria austrian baroque bell benedictine blue building buildings castle churches city cityscape clouds daylight erzabtei europe exterior festung festungsberg fortification fortress heritage high hill historic historical history hohensalzburg houses landmark landscape largest medieval monastery old peter roofs salzburg sankt season site sky spires stift summer sunshine tower trees unesco urban walls world