The only tower adjoining the Romanesque walls faces west for better control of access to the town. The tower increased the field of vision from the fortification over the whole area from Meseta to Cova da Beira, Serra da Estrela and Beira Baixa. It allowed visual contact with the castles of Belmonte, Covilhã and Monsanto and this was why it was called Facho Tower, in memory of the torches at night or the smoke of a bonfire by day so that the castles could see each other. It is rectangular and around 10 metres high. It is completely covered with stonemasons’ marks which date it back to the time of King Dinis or King Fernando.