Leuchtenburg Castle (Castelchiaro) above Lake Caldaro towers into the sky in the surroundings of Castel Varco in the locality of Vadena. The castle was probably constructed in 1250 by the Lords of Rottenburg. The castle complex has been protected by a circular wall which protected the castle complex from assaults. Due to the fact that the position of the castle is not really well-protected it has presumably been constructed in order to impress.
Numerous castles of the Rottenburg leadership have been razed after the conflicts with Frederick IV, Duke of Austria, in 1410, but not Leuchtenburg, which was handed over to the sovereigns and in the following years was lent to officials of Caldaro. After 1610 Leuchtenburg remained uninhabited and started decaying.
Only in the 20th century the walls of the ruins were conserved. Leuchtenburg consists of a circular wall inside which there were several residential buildings. However, today these buildings could only be preserved to some extend. However, there are also well-preserved rests of the great hall with frescos dating back to the 15th century.
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.