The remains of the Castle can be visited
Kaja Castle
The Kaja Castle Ruin, once the ancestral seat of the Lords of Chiowe, is on a hill near Merkersdorf in the Hollabrunn district, within the Thayatal National Park.
History+
The first documented mention of Kaja Fortress occurred in 1196, when Duke Frederick I sealed numerous documents here. In 1360, Niklas von Kaja sold the castle to Duke Rudolf IV, but by 1376, it passed as a pledge to the Counts of Maidburg-Hardegg. Towards the end of the 14th century, Johann and Heinrich von Leipa conquered the castle and used it as a base for raids. Between 1425 and 1427, Kaja fell victim to the Hussites. Around 1430, Ulrich von Eyczing received the castle for loyal services and began its reconstruction.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Maciek Wegrzyn
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 48.8267, 15.8881