Cologne Charterhouse (Kölner Kartause) was a Carthusian monastery established in 1334. The monastery developed into the largest charterhouse in Germany until it was forcibly dissolved in 1794 by the invading French Revolutionary troops. The building complex was then neglected until World War II, when it was mostly destroyed. The present building complex is very largely a post-war reconstruction. Since 1928 the Carthusian church, dedicated to Saint Barbara, has belonged to the Protestant congregation of Cologne.
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.