Castle Wild (Wildburg) lies southern behind the Castle Treis. It was built in the 13th or 14th century, probably as protection of the southern side of the castle Treis. In the fifties it was restored and made fit to live in. Back then, the northern situated, almost square, donjon was repaired and received a new roof. The great hall and other outbuildings were also rebuilt. Other buildings and the circular wall are just ruins. Wildburg is private property so you can visit it only from the outside.
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.