Time Out says
Visit this impressive building, constructed between the eighth and ninth centuries, to get an idea of the importance of the sea in medieval Barcelona. In spite of the later remodelings of this work cataloged as a National Heritage Site, its most Gothic architectural style was never lost. After it was a working shipyard, in the 19th century it became an artillery armoury, and later a barracks. Since 1941, the building houses the Museu Marítim, and during renovation works that were completed in 2013, an important Roman necropolis dating from the first century AD was discovered.