Ключевые слова: adventure, attraction, background, balkan, beautiful, building, bulgaria, bulgarian, city, cloud, clouds, cloudy, color, countryside, environment, europe, european, exterior, forest, green, hill, holiday, landscape, leaf, leaves, massif, mountain, natural, nature, outdoor, panorama, park, range, relax, science, season, sky, sofia, spring, sun, tourism, town, travel, tree, vacation, vitosha, wild, wilderness, wood, world,