Ключевые слова: architectural, architecture, building, buildings, city, color, colorful, colorful houses, culture, district, douro, downtown, europe, european, facade, heritage, historic, historical, history, house, houses, multicolored, old, oporto, picturesque, port, porto, porto cityscape, porto landmark, porto portugal, porto town, portugal, portugal house, portuguese, red, ribeira, ribeira porto, river, river front, rooftop, rooftops, tiles, tourism, traditional, travel, travel destination, typical, unesco, urban, windows,