Tynnelsö estate was first mentioned in 1282. Since 1306 it belonged to the Diocese of Strängnäs. During the 1490s bishop Kort Rogge built the first stone castle and the first floor is still the original. In 1522 Tynnelsö was acquired by Gustav Vasa and it belonged to the royal family until 1636, but was again later returned to the crown (during the Great Reduction in 1681). The current square-formed castle was built to the present appearance in the 1590s. In the 18th century Tynnelsö castle was abandoned and left to decay. The major restoration was made in 1826-1827.
Today the castle is closed due the restoration, which should be started in future. The surrounding garden includes lot of lime trees and a villa built in 1876.
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.