UWC Mostar (165-200 students) shares the building with Gimnazija Mostar (approx. 650 students). Before the war this school, also known as the Old Gymnasium, built in 1898 - 1902 during the Austro-Hungarian rule in Bosnia and Herzegovina, was one of the finest schools in ex-Yugoslavia. However, as consequence of the Bosnian War, nowadays Gymnasium Mostar teaches two national separate secondary school curricula, intended for Croat and Bosniak students.