The Ginsburg, lying high above the constituent community of Grund was mentioned in 1255 as a Nassau border fortification. The castle achieved historic importance in 1568 when William I of Orange-Nassau drafted plans to free the Netherlands at the castle, also making final preparations for the campaign there. On the Ginsburg Heath was the meeting point for the third army group under Count Ludwig von Nassau, making the Ginsburg, and thereby also Hilchenbach, into a starting point for the Dutch struggle for freedom. Nowadays, only the castle's keep is still fully preserved, the rest of the complex lying in ruins.
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.