Ruins of medieval fortification walls, Nesebar, Black Sea, Bulgaria, Europe

wall sight unesco world cultural heritage architecture europe people clear sky old ruin sunny unesco military walls nature incidental people landmark historical buildings building exterior people in the background travel day sky fortress fortification landmark outdoors travel destination sun bulgaria person black sea bulgaria european community nesebar nesebur nessebar nessebur southeastern europe unesco architecture attraction fortification wall horizontal medieval museum ruin sight tourism town travel village worlld heritage