Medieval Castle of Beja, in the north-western part of the city, on a hill and is visible from afar.

The castle was built in the XIII century, during the reign of King Dinis, the site of the ruins of the Roman and later Moorish strengthening .  Castle was built at the same time the city walls and was surrounded by battlements, and on every street corner stood a square tower .  Inside, right in the middle was a watchtower, dungeon, Torri di Menage, built of granite and marble .  The tower Torre di Menage - 40 meters, and is the highest watchtower in Portugal, as well as a splendid example of medieval architecture .  On the hinged teeth loopholes Torre di Menage - small pyramids .  Preserved Romanesque arch, which stands on the stone slabs .  To get to the top watchtower, which offers unparalleled views of the city and the plains, it is necessary to climb the spiral staircase, which has 197 steps .  On the way up visitors pass through three rooms with windows in the Gothic style .  It draws attention to the ceiling of rooms, designed in the form of fan-vault with a Gothic .  Currently, the castle houses a small military museum . 

Not far from the castle are the ruins of the city walls. The once tall and sturdy city walls were topped by 40 towers, and had five gates. On June 16, 1910 Castle Beja classified as a National Monument Portugal.