Aerial view by drone of Kaleto Rock Fortress rock formations, Belogradchik, Bulgaria, Europe

color image horizontal travel travel destinations aerial view drone shot outdoors day belogradchik vidin bulgaria europe cloud building architecture belogradchik fortress kaleto fortress built structure old ruin cliff landscape mountain forest tree past history cityscape city urban scene no people scenics architectural buildings cities urban cityscapes urban scenes daytime forests trees mountains outdoor outside travel destination tourist destination tourist destinations