Ключевые слова: army, artillery, background, balkan, barrel, bulgaria, bulgarian, cannon, cloud, clouds, colorful, defense, flower, green, gun, heritage, hill, historic, historical, history, landscape, liberty, memorial, memory, military, mountain, mountains, natural, nature, outdoor, panorama, panoramic, peaceful, scene, shipka, sky, summer, tourism, tourist, travel, tree, victory, war, weather,