Saarburg Castle was one of the first and most impressive castles (Höhenburgen) in the West, built by Graf Siegfried von Luxemburg in 964. It was damaged in 1431 by troops of Ulrich von Manderscheid. Johann II von Baden rebuilt the castle later. It was conquered several times in the wars of 17th-early 18th century and finally left to decay in 1734.
The castle hill is surrounded by high fortified walls. With a depth of 60 metres, the fortress well almost reached down to the river bed of the Saar. The upper part of the tower, which offers a wonderful view of the Saar valley and the pilgrimage church of St. Mary in the Beurig district.
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.