Lierna Castle is built on a peninsula that protrudes into the lake Como and consists of a group of connected buildings, rather than a single building. The main portion of the current buildings was constructed in the 10th century in Romanesque style upon former Roman ruins. The castle includes the 11th-century church of Saints Maurice and Lazarus (Chiesa dei Santi Maurizio e Lazzaro), associated with the Order of Saints Maurice and Lazarus.
The last military use of the castle was in the mid-16th century by Gian Giacomo Medici, known as 'Medeghino' (the 'small Medici'), who was primarily a mercenary.
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.