In the parish of Carreira, on the lagoon of Carregal appears Mount Castro, covered with pine forest. In a pleasant walk you can reach near the summit, where the castro known as A Cidade is.
Although the remains of the prehistoric village are difficult to find for non-experts, is remarkable a giant set of rocks of fantastic shapes. It served, along with the hermitage of San Alberto, orientation point for inshore fishing vessels.
There are many archaeological sites that have been discovered in your environment: axes, polished stones and ceramics. At the foot of Mount mámoas fields and prehistoric burials are also cited, since the Father Sarmiento saw on his trip to Galicia in the eighteenth century.