The Pskov Krom (or Pskov Kremlin) is an ancient citadel in Pskov. In the central part of the city, the Krom is located at the junction of the Velikaya River and smaller Pskova river. The citadel is of medieval origin, with the surrounding walls constructed starting in the late 1400s. The Krom was the administrative and spiritual centre of the Pskov Republic in the 15th century. In 2010, two of the towers of seven (the Vlasyevskaya, which dates to the 15th or 16th century, and the Rybnitskaya, which dates to 13th or 14th) were damaged in a fire.
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.