Ключевые слова: aerial, aerial view, arch, architecture, background, balkan, battle, beautiful, building, bulgaria, bulgarian, cold, freedom, highway, hill, historical, historical building, ice, landmark, landscape, liberty, monument, morning, mount, mountain, mountain peak, mountain ridge, nature, panorama, panoramic, peaceful, scenery, scenic, sky, snow, stone, sunlight, sunrise, sunshine, tourism, tower, travel, view, white, wilderness, winter, winter landscape, winter scene,