Zvornik is a medieval castle located in Zvornik, Bosnia and Herzegovina, on the mountain Mlađevac overlooking Drina Valley.
The medieval town of Zvornik called 'Đurđevgrad' or 'Kula Grad' was first mentioned as a property of Bosnian medieval feudal family Zlatonosović in 1410 when Hungarian King Sigismund was in the area. It was probably built in the 12th or 13th century and is one of the largest medieval fortresses in Bosnia and Herzegovina.
Part of the structure was destroyed in 1878 during the Austro-Hungarian invasion of Bosnia and Herzegovina.
Ustasha troops of the fascist Independent State of Croatia occupied the fortress along with the rest of Zvornik and most of Bosnia, in April 1941. The fortress was liberated in July 1943 by the 1st Proletarian Brigade during the Battle of Zvornik.
Beginning on 8 April 1992, about 300 soldiers of the Army of the Republic of Bosnia and Herzegovina defended the fortress from Serb soldiers of the Yugoslav People's Army during the first stages of the Bosnian War. Following the Bosnian War, Zvornik became a part of Republika Srpska and the new Serb government had a church built on the grounds of the fortress and relocated a church bell from the village of Divič to the new church to mark their victory over Bosniaks.
In May 2013, the remains of several war victims from the 1990s conflict were uncovered in Kula grad.
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.