Unlike the neighbouring Neurathen Castle very little is known about the history of Altrathen Castle. It was probably built at the same time in the 11th century. The castle was first mentioned in the records in 1289. In 1469 Altrathen and Neurathen castles were slighted.
In 1888 the industrialist, Eduard Seifert, bought the ruins of the castle and rebuilt it in 1893 in a Neogothic style. Of the medieval castle only the cellars and parts of the spiral staircase of the keep have survived.
Aftern 1945 the building acted as a holiday home and later for the East German state bank. In 1995 the site was sold by the Treuhandanstalt to a private owner. Since then the building has been used as a small hotel and restaurant.
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.