St. Stephen's Cathedral is a baroque church built in 1688. Since 730, there have been many churches built on the site of the current cathedral. The current church, a baroque building around 100 metres long, was built from 1668 to 1693 after a fire in 1662 destroyed its predecessor, of which only the late gothic eastern side remains. The cathedral's overall plan was made by Carlo Lurago, its interior decoration by Giovanni Battista Carlone, and its frescos by Carpoforo Tencalla.
Over time, the Passau Cathedral has acquired the largest organ outside of the United States. It is also the largest cathedral organ in the world. The organ currently has 17,774 pipes and 233 registers, all of which can be played with the five-manual general console in the gallery. Portions of the organ have their own mechanical-action or electric-action consoles, for a total of six consoles.
The cathedral has eight large bells in the bell rooms in the north and south towers. The heaviest, Pummerin at 7550 kg cast in 1952 and Sturmerin weighing 5300 kg cast in 1733 hang in the south tower. The other six bells hang in the north tower.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.