Jever castle dates back to a weir from the late 14th century. The fortress got its typical characteristics mostly from the massive keep, which during the 15th and 16th century was surrounded by a Vierseitanlage. When Jever became part of the Duchy of Oldenburg in 1818, the castle was declared an auxiliary residence of the Dukes of Oldenburg and the now useless outbuildings and fortification were done away with. The museum has been situated in the castle since 1921 and features collections of cultural history, folklore and the archaeology of the Jever region.
The historic rooms also give an overview of the lifestyle of the 16th to 19th century. You will have the best view from the 67 meter-high castle tower. The viewing platform offers a unique view over the expanse of the Friesian coast.
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.