Borgarfjörð, the 'fjord of the borg', now West Burra Firt, was so named by the Norsemen on account of the borg (broch) or 'Pictish tower', which still stands on the little holm north of West Burra Firth pier, now greatly ruined. The broch dates to the very early 1st century AD and in the 19th century was 'connected with the land by a bridge of large stepping-stones over which the sea flows at full tide.' The diameter is 18 m and the walls are an average of 4.6 m thick. The stone still stands eight or nine courses high in places.
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.