In La Ferté-Milon stand the ruins of an unfinished castle, whose façade was 200 m long and 38 m high. The first castle was erected already in the 9th century AD, but the current structure dates from 1393, when Louis of Orléans started to reconstruct a strong castle. It was cancelled in 1407, when Louis was assassinated.
The singular form of the tower walls was probably designed to resist cannons and protect the gate. The façade is preceded by a moat. On the right is a square tower of which two bare walls remain. The top of the ramparts is adorned with machicolation. Access to the town was protected by a former gate of which two towers remain. Behind the ramparts, two 160 mm cannons from 1909 sit facing towards the valley.
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.