Photograph of a view of the sea walls of Barcelona. The walls run diagonally through the photograph, skirting the port where small boats are moored. On the right of the wall is a promenade bordered by tall buildings facing the sea. In the background, on top of Montjuïc hill, stands the Castillo de Montjuïc with a single tower bordered by a defensive wall.  

Barcelona's sea walls were constructed during the first half of the 15th century as a safeguard against raids made against the city by Pirates. In 1834 Captain Ramon de Meer altered the design of the walls to include a wide walkway that functioned as a promenade. Montjuïc castle was originally constructed as a fortress during the 1640's and was altered to include battlements in 1694, thus transforming the fortress into a castle. In the late 18th century, the castle was again altered to give the castle the appearance that it has today. The castle now serves as a museum.