Saint Nikola Bolnicki was built in 1313 with dormitories around them which were used as quarantine stations for visitors of Ohrid. After the coming of the Turks the structure of the city changed and they lost their purpose, so they were turned into hospitals. That is where the name Bolnicki comes from (bolnica - hospital).
The paintings on the walls of the church originate from several periods. Also the figures of St. Clement, St. Nikola and St. Pantelejmon, which are represented in life size, as well as the images of the holy warriors Theodor Tiron and Stralitat are notable. The few icons in the church are also of special value, the most significant being the litian (religious procession) icon dedicated to St. Naum.
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.