Kalocsa is the Episcopal see of one of the four Catholic archbishops of Hungary. Amongst its buildings are a fine cathedral, the archiepiscopal palace, an astronomical observatory, a seminary for priests, and colleges for training teachers.he Asztrik Square is named after the first archbishop of Kalocsa (see the history part of this text). The building of the Convent is surrounded by horse-chestnuts. Its north side-wing with the church was built in 1860. The second floor was put on in 1913 and since that time it got its romantic shape.