Plainburg Castle - the family seat of the Counts of Plain and a symbol of Großgmain - is one of Austria's oldest castle ruins and offers a magnificent view over Großgmain and the surrounding mountains. All that remains of the original structure are the outside walls, with a thickness of 1.4m and standing to a height of over 5m. A short climb rewards the visitor with the opportunity to stop and rest awhile at the viewing platform overlooking Großgmain. Before it became the seat of the Counts of Plain, the mountain was a Celtic burial ground during the late Bronze Age around 1200 BC. Some time later, in about 1100 AD, Count Werigand of Plain built Plainburg Castle.
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.