Ordensburg Vogelsang is a former National Socialist estate placed at the former military training area in Eifel National Park. The landmarked and completely preserved estate was used by the National Socialists between 1936 and 1939 as an educational centre for future leaders. Since 1 January 2006 the area has been open to visitors. It is one of the largest architectural relics of National Socialism. The gross area of the landmarked buildings is 50,000 m2.
The three buildings at Eifel have been known as 'NS-Ordensburg' since 1935. The first phase of the project was the construction of the Castle of Vogelsang, which with up to 1,500 workers took only two years. Several much bigger buildings were also planned, such as a huge library to be called the 'House of Knowledge' measuring 100 metres by 300 metres, a 'Kraft durch Freude' hotel with 2000 beds, and the biggest sports facilities in Europe. Construction at the site halted on the outbreak of war.
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.