Dunyvaig Castle was built on top of an ancient fort or dun in the 12th century. Forfeited in 1493, the castle passed to the MacIans of Ardnamurchan. Afterwards the castle was leased to the MacDonalds, then the Campbells and back to the MacDonalds.
In the 17th century Dunyvaig was conquered several times by the English and Scottish armies. The castle was seized in 1647 by the Covenanters and passed into the hands of the Campbells of Cawdor, who held it until 1677, when Sir Hugh Campbell pulled down the castle and moved to Islay House.
Today all that remains of the castle are mainly the ruins of the sixteenth-century castle, although the site includes a thirteenth-century courtyard, and a fifteenth-century keep.
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.