Čačvina Castle guarded approach from Bosnia during the wars with the Ottomans. It is 705 metres above sea level about 8 kilometres from the town of Trilj. Its strategic location enables its crew to oversee the traffic of goods through the mountain passage that goes through the Dinaric Alps and leads to Bosnia. First written record of fortification dates to 1345.
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.