Siesikai Castle is the residential castle built by Gabrielius Daumantas-Siesickis in the 16th century in the Renaissance style. His heirs were known as Daumantai, also called Siesicki, had given their family name to the nearby town. The masonry palace was reconstructed in the Neoclassical style after 1820 by Dominik Dowgiałło. Only 2 towers remain from the former castle, which had four of them in every corner of the palace. The castle has been undergoing restoration since 1990.
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.