Da antiga fortificação medeval, restam a Torre de Menagem e parte da alcaçova do Séc.XII, com ameias prismáticas, e asportas voltadas a norte e poente. Subsistem parte da barbacã e as torres que flaqueavam uma das portas da cerca. No séc XVII teve obras de adaptação a fortificação abaluartada que envolveram o primitivo recinto fortificado.
The country´s northernmost outpost - is a small border town sitting high above the Rio Minho. Try to arrive for the Friday market when chickens, ducks, sticky buns, furniture, pottery, cabbages and corsets the stretch of road around the old walls. Its one historic feature is the ruined fortress, much fought over during the Wars of Restoration, but now litle more than a Tower and a few walls handy for hanging out washing.