Kaleto fortress, rock formations, Belogradchik, Bulgaria, Europe

ancient civilization belogradchik blue sky brick bulgaria clear sky color image day environment europe fortress growth historical landmark horizontal kaleto landscape low angle view mountain nature nobody outdoors path photography remote rock rock formation rock formations rugged ruins sunny travel travel destinations tree ancient ancient civilisation bulgarian civilisation civilization cloudless color colour daytime development european formation fort historical history isolation landmark outside peak seclusion sky south east europe southern european stone sunshine tough walkway