The oldest part of the Ardre Church is the tower, dating from about 1200. The tower originally belonged to an earlier church building from the 12th century, the nave and choir of which was replaced with the current building circa 1250. The sculptured choir portal originally also belonged to the earlier church.
The interior of the church was heavily remodelled after plans by artist Axel Herman Hägg in 1900-1902, in a neo-Gothic style. The dominating wall paintings are consequently designed by Hägg. A few stained glass windows remain but were complemented by modern replicas during the renovation.
The furnishings of the church are still largely medieval: an altarpiece from the early 14th century, a triumphal cross and baptismal font, both from the middle of the 13th century, and a carved wooden Madonna from circa 1500 are all in their original milieu. The organ is an elaborate Gothic Revival piece, made for the renovation in 1902 and inspired by medieval French organs.
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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.