Diadar Tower, Belgrade Fortress, Kalemegdan Park, Belgrade, Serbia, Europe

photography colour colour image color color image horizontal horizontal image outdoors outside day background people incidental people people in the background travel destination travel destinations travel belgrade serbia europe european elevated view city cities high angle view high angle belgrade fortress kalemegdan park tourist destination landmark landmarks famous well known well known kalemegdan diadar tower fort forts fortified fortification fortress fortresses history historical historic heritage antiquity tower blue sky archaeological site ancient civilisation