Ключевые слова: 9th century, ancient, antique, arch, archaeological, architecture, building, castle, circular, city, culture, door, doorway, entrance, era, europe, fort, fortification, fortress, harald bluetooth, heritage, historic, historical, history, home, house, king, light, museum, nature, old, protection, reconstruction, scandinavian, stone, street, town, village, wall, window, wood, wooden,