Kullerstad church is a whitewashed Romanesque stone church dating from the 13th century. It is known of two Gunnar's bridge runestones: according runes there was a man named Håkon who dedicated a bridge to the memory of his son Gunnar. The first runestone was found in the exterior wall of the church of Kullerstad in 1969 and is raised in the cemetery. The second stone was discovered in a church only 500 metres away and is also raised in the cemetery. The second stone informs that Håkon raised more than one stone in memory of his son and that the son died vestr or 'in the West.'
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.