The Dalaborg Castle was built in 1304 by dukes Erik and Valdemar (the sons of Magnus Ladulås) during the war against the king Birger. The castle was destroyed in 1434 in the so-called Engelbrekt uprising. The Queen Margareta, regent of Norway and Denmark, was named also as a regent of Sweden in Dalaborg in 1388.
Today the moat, ramparts, a terrace and the cellar of a blockhouse remain of castle. A model of Dalaborg before it was destroyed can be seen at Mellerud Museum.
References:Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.