Ключевые слова: autumn, background, balkans, beautiful, beauty, bulgaria, clouds, colorful, colors, destination, environment, europe, fall, foliage, forest, green, hiking, hill, hills, holiday, landscape, leaf, leafs, mountains, national, national park, natural, nature, october, orange, outdoor, panorama, park, rhodope, rila, rila national park, scene, scenery, scenic, season, sky, tourism, tourist, travel, tree, vacation, valley, vibrant, view, yellow,