Regional Archaeological Museum was founded in 1918. In June 2007, the museum moved into a new, purpose-built building in a center of Braga. The museum's collection includes artifacts from archaeological sites dating from the Palaeolithic and the Middle Ages. Regional Archaeological Museum is also called the Museum of Diego de Souza.

Diego de Souza was the archbishop and prominent political figure in Braga in the XVI century. He made a lot of good for the city, transforming the medieval town into an ideal Renaissance city: widened streets, squares and built a new church, founded hospitals, reconstructed the cathedral city. Archbishop fond of antiques. Diego de Souza initiated the establishment of the museum in order to protect the archaeological heritage of Braga, but the museum was established only at the beginning of the twentieth century and became known as the Museum of History of Art and Archaeology.

The museum is open regularly, and only in 1980, the museum began to work steadily and was renamed the Regional Archaeological Museum. Since then, the museum has focused its activities on the protection of local and regional archaeological heritage, as well as holding exhibitions.

The museum's exhibits are arranged in four halls. In the first room, visitors can see a collection of objects from the Paleolithic period until the Bronze Age. The second and third halls of the exhibition tells about the development Brakara Augusta Roman settlement, later became the city of Braga. In the fourth hall of detail to consider items of religious art of the early medieval, Romanesque and Gothic periods.