Drzewica Castle was built between 1527 and 1535 by Archbishop of Gniezno Maciej Drzewicki. The Archbishop built the castle on the peripheries of the town, by the river Drzewiczka and encircled the fortress with moats, separated by a bulwark. The building's plan is based on a regular rectangular shape. Its defence systems are based on four square towers located in each corner of the castle.
The building burned down in 1814, remaining a well preserved ruin. Thus, the castle did not undergo any later modifications, remaining one of Poland's best preserved residences from the first part of the sixteenth-century.
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.