The "Semberija" Museum is located in the oldest building, which contains 4 exhibition halls with an area of 105 square meters and one hall for occasional exhibitions. They house 3 permanent museum exhibits with all-day and daily openness. The archeological exhibition is on the ground floor of the museum and includes the material remains of civilization from the Neolithic to the late Middle Ages. In addition, there is the largest and most significant collection of medieval inscriptions in BiH and beyond with 23 Cyrillic inscriptions in the Old Slavonic language. There is also a collection of Roman stone monuments, but also finds from the most researched medieval site of Jazbina in Batković and a medieval cast pot from Ostojićevo. The ethnological exhibition includes objects related to the folk life of the village of Semberija and the old town culture of Bijeljina.