Classified as a National Monument in 1910, the castle that stands before our eyes today occupies an area of 3.2 hectares and has an approximate perimeter of 670 metres. Its irregular oval-shaped wall is cut through by pyramidal battlements and punctuated by 23 towers, of which 10 are turrets, 2 are hexagonal and 11 are quadrangular.
Today, access to the Keep is via the north-facing side, via an external staircase made of schist masonry, attached to the tower's hull.
This is flanked by seven magnificent turrets (three to the east, three to the west and one to the south) vaulted in brick, which join the wall on the north side of the fortification.
Inside, the Military Museum, officially founded in 1983, occupies four floors, sixteen rooms, terrace and crypt of the Keep, as well as the entire exterior space flanked by the turrets, including the Princess Tower. This museum has a collection of great historical value, which allows us to follow the evolution of light weapons from the 16th century to the mid-20th century. It seeks to promote the appreciation, enrichment and exhibition of the historical-military heritage attributed to it and to promote the cultural values linked to military history. Visitors can also climb to the crenellated terrace to admire the wonderful landscapes, with views of the Nogueira, Montesinho and Coroa mountains, the peaks of Sanábria and the lands of Leon.