The tower and Fortress of O Castro, which already had the generic protection of Spanish castles from the year 1949 and was declared a Cultural Interest Asset (B.I.C.) on 17/11/1994 with the category of Monument, the year it was donated to the City Council of O Barco de Valdeorras. It is a medieval construction from the 14th century that suffered partial destructions and reconstructions, possibly derived from the irmandiñas revolts, becoming the property of the counts of Rivadavia at the end of the 15th century. It underwent new reforms in the 18th century for use as a prison. After the abolition of the lordships in the 19th century, it was neglected, reaching a state of abandonment and ruin. In 2010, the City Council of O Barco initiated the procedures before the Ministry of Public Works for the rehabilitation of the monument, funded by the 1% Cultural. Once approved by this body, the works were completed in 2013 with a budget of nearly €600,000, and with various fields of action: The archaeological excavations carried out around the tower revealed the bimillennial origins of O Castro: a group of huts that overlap over time, revealing bases of the first pre-Roman straw-clay huts and later circular and rectangular stone constructions, corresponding to the two phases of Roman occupation (1st-2nd century A.D. and 3rd-4th century A.D.), later surpassed by medieval constructions and the castle itself. Themedieval tower was consolidated, maintaining its romantic ruin character, investigating the different phases and construction techniques used in its walls, and exposing the historical references of all discoveries. The building was completed with a modern design metal staircase, interspersed with different terraces, allowing both the contemplation of the tower and the views of the surroundings. The intervention is integrated into the village layout, completed with the urbanization of the accesses, the consolidation of a cave under the path, and the creation of a square next to the tower where the archaeological footprint of the Roman castro is represented, forming a public space of great harmony that becomes a spectacle with night lighting. The complex can be visited without a guide, as it has a series of explanatory panels that inform about the characteristics of the monument. The building constitutes the landscape summit of the O Castro complex, and can be observed on different pedestrian routes from O Córrego, Outarelo, Xagoaza, and Tremiñá.