Ключевые слова: architecture, assembly, bell, bell tower, brutalist, bulgaria, capital, children, communism, complex, comunist, concrete, culture, destination, flag, flag of peace, heritage, historic, history, international, international childrens assembly, kambanite, landmark, memorial, monument, mountain, outdoors, park, park kambanite, peace, sight, sightseeing, sofia, the bells, touristic, tower, travel, trip, un, unesco, unicef, urban, view, vitosha, vitosha mountain, zname na mira,