Engelstein Castle was first mentioned in 1417 but it is probably much older. It is probable that at first it was a simple watch tower, guarding a nearby road crossing, which was upgraded to a water castle after the destruction of Hadmarstein Castle on the nearby Johannisberg mountain at the end of the 13th century. It was situated on a granite cliff surrounded on 3 sides by small lakes.
In 1531 the castle went to Benedikt Schaul who started to transform the still medieval fortress into a Renaissance castle. The Barons of Windhag continued this elaborate reconstruction and gave the castle its present outlook. The costs however were so enormous that the barons were soon heavily indebted after which the castle was confiscated at the end of the 16th century.
In 1619 Engelstein Castle was stormed by Imperial troops and plundered. In 1681 it was bought by Adam Anton Graf Gundemann, whose descendants owned the castle for the next 150 years. Then it went to the Barons of Geusau who owned it until 1916.
Several other owners followed until it was acquired by the industrialist Erich Meinl in 1964. By then the castle was in a bad state due to being plundered and neglected during and after World War II. Now the bailey is inhabited by a descendant of Meinl.
At present Engelstein Castle is privately inhabited and can thus not be visited.
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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.