Ключевые слова: architecture, blue tile, building, city, culture, decorative, direction, downtown, european, exterior, famous, famous place, guide, historic, iconic, identity, landmark, lettering, navigation, old, outdoor, plaque, porto, portugal, portuguese, praca da liberdade, public space, sightseeing, sign, street, street name, street sign, symbol, tourism, travel, typography, urban, urban detail, wall, white,