medieval fortified city smederevo fortress or smederevo`s 15th century fortress / smederevska tvrđava ili smederevska utvrda

15th ancient architecture balkan bricks bridge building castle century city construction cultural culture danube destination europe exterior famous fort fortification fortified fortress heritage historic historical history ili landmark landscape medieval military monument national old outdoors river rock ruin ruins serbia serbian sight sightseeing smederevo smederevos smederevska srbija stone strong stronghold tourism tower town travel trip tvrđava utvrda vacation wall walls water