Castillo de Gigonza site has been in existence since antiquity. The present castle is of Andalusian origin and almost square in shape, with two parts to its structure. The current appearance dates from the 13th and 14th centuries. A narrow and low door contains a lintel with two heavy imposts. The upper floor is vaulted and contains windows. The grounds contain a surrounding fence. The courtyard is accessed through a door with and arch, displaying a coat of arms of the Casa de Arcos.
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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.