Torre de Pena is a well-preserved medieval fortress tower located at 747 meters above sea level in Xinzo de Limia, Ourense, Galicia, Spain. Built in the 12th century as part of a defensive system including the castles of Sandiás, Porqueira, and Celme to protect against Portuguese attacks, the tower features a distinctive square keep with four intact faces, loophole windows, and the curve of an old wall. Originally conquered by the Duke of Lancaster in 1386, the structure's history is marked by disputes between the powerful Monterrei and Lemos families. The tower commands panoramic views of the Antela valley and surrounding plains from its hilltop position. Designated as a Good of Cultural Interest, it was transferred to the Xunta of Galicia in 2009 and remains accessible for viewing externally.