The first known owner of Sjöö castle was Peter Laurensson, mentioned in 1409. In 1541 the castle was bought by Jacob Vestgöte Sjöö and named after him. The present castle was built during the ownership of Johan Gabriel Stenbock. The castle was designed by Nicodemus Tessin the Elder and Mathias Spieler. The castle with its park is considered one of the most beautiful castles in Sweden with its perfect and harmonious proportions. In 1813 Sjöö castle was sold to Johan Gustav Baner, and it's still owned by the family Baner.
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.