Colmberg Castle was built in the 13th century and purchased in 1318 by Duke Frederick IV of Nuremberg. In 1791 Colmberg fell under Prussian administration. From 1806 to 1880 it became the seat of the revenue office of the Kingdom of Bavaria. In 1927-1964 it was owned by the last Imperial Consul in Japan. Int1964 Unbehauen family of Colmberg bough the castle and started to reconstruct it into a comfortable hotel.
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.