Hohes Schloss (High Castle) in Bad Grönenbach was built originally in the late 12th century. The latest remaining parts where built around 1280 by Heinrich Ludwig von Rothenstein. It was enlarged in the 14th century.
In 1482 the castle was acquired by Pappenheim family. It was besieged and damaged during the Peasants' War in 1525 and conquered by Bayern and French armies in 1703 during the war of Spanish Succession.
Today Hohes Schloss is used for events, guided tours etc.
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.