Located in the village of O Bolo, it is one of the most emblematic and important monuments in the area. Its first construction dates back to the 12th century (D. Urraca) or the 13th century (D. Sancha). Subsequently, the castle belonged to the Counts of Lemos. Due to the Irmandiñas revolts, the castle suffered significant damage and was rebuilt at the end of the 16th century under the patronage of the Count of Benavente D. Juan de Pimentel. At the end of the 16th century, the town of O Bolo went from being a lordship to being a royal domain (becoming directly dependent on the crown). The castle has survived to the present day after a history of destruction, abandonment (the castle was used as a quarry, primary school, prison, or festival ground). In 1999 its rehabilitation began, with the works concluding in 2001. The O Bolo Castle museum is open to the public, it is interactive and allows us to approach the fascinating history of the 15th-century fortress in an enjoyable and entertaining way. This interpretation center reveals the evolution of the castle from its origin to the present day. For this, the exhibition includes the recreation of different period environments, reproduction of objects, panels, texts, and illustrations that can be touched and used so that the visitor can feel like an actor in history. Thanks to its rehabilitation, it is possible to access its terrace or view the scenery offered by the tower, which is approximately twenty meters high. This museum, as an interpretation center, has two spaces: the keep itself and an annex building constructed later (16th century) and attached to the tower. From the castle, apart from its keep, remains of the wall have survived, both the outer and inner walls, with semicircular bastions or bulwarks on the walls and circular ones at the corners, the parade ground, and the cistern.