The Groote Kerk of St. James (15th and 16th centuries) has a fine vaulted interior, and contains some old stained glass, a carved wooden pulpit (1550), a large organ and interesting sepulchral monuments, and some escutcheons of the knights of the Golden Fleece, placed here after the chapter of 1456.
It is remarkable for its fine tower and chime of bells, and contains the cenotaph monument of Jacob van Wassenaer Obdam, designed by Cornelis Moninckx and sculpted by Bartholomeus Eggers in 1667, and the renaissance tomb of Gerrit van Assendelft (1487 - 1558).
The church's six-sided tower is one of the tallest in the Netherlands. There are 34 panels with shields and names of knights of the golden fleece. The mechanical clock has 15 bells by M. de Haze in 1686, one by Jasper and Jan Moer from 1541, one from H. Van Trier from 1570, one by Coenraat Wegewaert from 1647, and one from C. Fremy from 1692 and 31 modern bells. In the church tower there is an automatic carillon by Libertus van den Burgh, from 1689.
The church endured a fire in 1539, and the stained glass windows were repaired by leading glass artists, including the brothers Dirk and Wouter Crabeth of Gouda. Charles V, Holy Roman Emperor, who visited the church after the fire, sponsored two windows by the Crabeth's that due to their royal origin are the only two windows that have survived up to the present day. Under one of these windows lies a commemorative stone from 1857 for Constantijn and Christiaan Huygens, who were buried in unmarked graves in the choir of the church.
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.