Schengen Castle dates from 1390 but it was was torn down by the industrialist Jean-Nicolas Collart in 1812. He built a residential manor house in its place and now Schengen Castle is a hotel and conference centre.
All that remained of the medieval building was its round central tower. The castle's most famous visitor was certainly Victor Hugo who visited the Collarts in 1871 and made a sketch of the old tower.
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.