The Citânia de Santa Luzia, known locally as "Cidade Velha", is one of the best known Castros in Northern Portugal and undoubtedly one of the most important for the study of Proto-History and the Romanization of Alto Minho.
Monte de Santa Luzia
Viana do Castelo
Its strategic location, allowed it not only to dominate vast areas of the riverside coastal area, but also, and very especially, to control the movement of entrances and exits at the mouth of the River Lima, which in classical antiquity would be navigable over a large part of its course. The Village has its own characteristics, mainly in terms of architectural structures, with emphasis on the polygonal apparatus, used in some of the houses, which have a circular floor plan with a vestibule or atrium, which in some cases housed bread baking ovens.
http://www.cm-viana-castelo.pt/pt/percursos-culturais