Built to defend the north and east entrances of the city, the fortress has played a decisive role in several episodes of the history of Barcelona. The fortress in the present form is the result of the remodeling of the old castle (of the 17th century), carried out between 1753 and 1779 by the military engineer Juan Martín Cermeño.
✔ The bridge and the gatehouse. In the middle of the main facade stands the neoclassical monumental gate, flanked by two columns, which is accessed through a bridge that crosses the Santa Eulalia moat.
✔ The four bastions, triangular or pentagonal shaped. Two of them are located in the corners of the main facade (the bastion of Sant Carles and the bastion of Santa Amalia) and the other two in the second enclosure (the bastion of Velasco and the bastion of Llengua de Serp).
✔ The quadrangular inner yard, located in the highest part of the castle. From the terrace that covers the buildings situated around the ward the visitors can enjoy the best views over the coast of Barcelona and the Baix Llobregat region.
✔ The covered walk that surrounds the outer perimeter of the castle.