This city district was developed for the 1929 International Exhibition and features several high-profile museums including the National Museum of Catalan Art, the Museum of Archaeology, and the Ethnology Museum.
Of those, the art museum is particularly recommended, and the views of the city from its steps are stunning. Below this, and also built for the exhibition was the Magic Fountain, which puts on a light and music show every half hour on the weekends. This is best seen at night of course.
At the very top of the hill is the 17th-century fortress, which saw action in the Catalan Revolt in the 1600s as well as during the Civil War in the late-1930s, after which it was a prison.