Considered the oldest building in Cadiz, this fortress has a three-pointed star shape. To enter it, people had to pass through a drawbridge, while the walls and bastions closed its perimeter. Once inside, the irregular plant courtyard was opened, which led to the various departments of the castle, the chapel and stores. Currently, it is used for conducting cultural events of all kinds. The visit to the castle and its exhibitions are free, and last for about one hour.