Château du Kagenfels (also known as Kaguenfels or Kagenburg) is a ruined castle situated in the Forest of Obernai, in the commune of Ottrott. The castle was constructed in 1262 by Albrecht von Kage, Ministerialis of the Bishop of Strasbourg. The castle passed successively to the nobles of Hohenstein, then to Utenheim and Ramstein, who sold it in 1559 to Lucas Wischbech who repaired and enlarged it. In 1563, the town of Obernai bought it. It was destroyed during the Thirty Years War and is recorded as ruins in 1664.
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.