Ruins of Starý Rybník castle are on a tiny rocky ridge between two ponds at the village of Starý Rybník. The castle was probably founded sometime during later part of the 14th century. Soon afterwards the castle passed on to the Frankengrüner family from Cheb. It was later acquired by the Gumerauers and the Brambachs, and throughout the major part of the 16th century it belonged to the Lords of Wirsperg. In the following years, it frequently changed hands, from the Trautenbergs to the Hartenbergs and later to the Perglars of Perglas. In 1787, it was acquired by Johann Georg Wilhelm whose family held it up to 1945.
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.