Valdštejn Castle (Waldstein) is an early Gothic fortress near Turnov, in the Czech Republic. The city was built on three sandstone cliffs in the second half of the thirteenth century by Counts of the Waldstein family. After 1420 the castle was occupied by the Hussites, then later by robber barons. In 1621 the abandoned castle was bought back by the Waldsteins, whose most illustrious member was Albrecht von Wallenstein. During the peak of the Baroque period, they built a pilgrimage church, dedicated to John of Nepomuk, in 1722 on the ruins of the castle.
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.