The Kaukai (Obelytė) complex is on the left bank of the Peršėkė runlet. It has been dated back to the 11th century. The complex is set up of two mounds that are in two different villages, a pertinent of the castle (suburbium) and a subjacent village. The main mound was in the highland of the Perseke runlet left bank winding. The other mound, Obelytė, tree-covered and almost decayed now was on the right bank. A big territory of the pertinent of the castle had a garden and of farmstead. One can climb up the wooden steps to the Kaukai mound.
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.