The Basilica church of St. Ursula was is built upon the ancient ruins of a Roman cemetery. The church has an impressive reliquary created from the bones of the former occupants of the cemetery. It is one of the twelve Romanesque churches of Cologne and was designated a Minor Basilica in 1920. While the nave and crossing tower are Romanesque, the choir has been rebuilt in the Gothic style.
The Golden Chamber, or Goldene Kammer, of the church contains the alleged remains of St. Ursula and her 11,000 virgins who are said to have been killed by the Huns, possibly around the time of the Battle of the Catalaunian Plains. The original legend said only 11 virgins accompanied St. Ursula but the number grew over time, eventually to 11,000. The walls of the Golden Chamber are covered in bones arranged in designs and/or letters along with relic skulls. The exact number of people whose remains are in the Golden Chamber remains ambiguous but the number of skulls in the reliquary is greater than 11 and less than 11,000. These remains were found in 1106 in a mass grave and were assumed to be those of the legend of St. Ursula and the 11,000 virgins. Therefore, the church constructed the Golden Chamber to house the bones. The bones themselves are neatly arranged in 'zigzags and swirls and even in the shapes of Latin words.'
References:When are Saturday and Sunday Masses held?
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.