In the early 13th century a Romanesque basilica with three naves was built on a projection shooting off the Paradajz hill - the Church of Saint Mary. In the 15th century a wall was erected to protect the church and the cemetery next to it. In the 1540s the church was rebuilt so that it could function as a fortress against the Turkish raids. The vault above the main nave was pulled down - the present courtyard of the castle emerged. Later the walls were fortified. The building complex of the Old Castle includes also the Chapel of St. Michael. This Romanesque rotund building has two parts: the above-ground carnarium was used as a place where dead bodies were laid before burials, in the underground ossarium bones extracted from old graves were kept. There are interesting fragments of 14th century frescoes on the walls of the Chapel. The nearby "Himmelreich" bastion also dates back to the 14th century and it has a history of serving as a prison.