Ключевые слова: ancient, architecture, balkan, bricks, bridge, building, castle, city, construction, cultural, culture, danube, destination, europe, exterior, famous, fort, fortification, fortified, heritage, historic, historical, history, landmark, landscape, military, monument, national, old, outdoors, protection, river, rock, ruin, ruins, serbian, sight, sightseeing, stone, strong, stronghold, tourism, tower, town, travel, trip, vacation, wall, walls, water,