Holsteinborg Castle was built by the Trolle family between 1598 and 1651, but has been owned by the Holstein family since 1707. The first count, Ulrich Adolph Holstein, established ten village schools on the estate in about 1710. The first Christmas tree in Denmark was lit at Holsteinborg in 1808, Northern Europe's first savings bank was opened in 1810 and Denmark's first health insurance was available in 1811. Between 1810 and 1825, a total of 14 schools and 12 handicraft schools were built on the estate. Hans Christian Andersen was inspired by his many visits to the castle, where he wrote some of his fairytales, stories, songs, poems and accounts of his travels.
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.