Cave of os Penedos Nature · Becerreá, Ancares, Lugo Image of Becerreá, not of the place itself. A natural cavity in the municipal district of Becerreá opened in the limestone materials of the sierra; the concello also preserves castro sites at Castelo, Guilfrei and Guillén, on the same outcrops. Photo: Adrián Estévez (User:Estevoaei) (CC BY-SA 4.0) What to see and do in Becerreá