The Russian Old-Believers (starovery) have kept their religious rituals unchanged for more than 1000 years. Today, there are 11 starover congregations with approximately 15 000 members in Estonia. A museum situated in Kolkja village on the coast of Lake Peipsi displays traditional clothes, crafts, tools, household items, and religious items of the Old-Believers.
Reference: Kolkja Museum of Old Believers
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.