The remains of the Castle can be visited
Weidenburg Castle
The Weidenburg castle ruin, a ministerial seat, stands on a steeply sloping rock spur south of Würmlach in Carinthia. The remains of this complex offer a glimpse into past times.
History+
The origins of Weidenburg Castle likely date back to around 1200, when it was built as a ministerial seat. Its first documented mention occurred in 1225 as "castro Weideberg" in connection with Johannes de Waidberch. The castle changed hands multiple times, coming into the possession of the Counts of Görz, among others. Following the Peace of Pusarnitz, it fell to Emperor Frederick III in 1460, who enfeoffed it to the Hornberger brothers in 1461 and later to Hans von Graben. In 1545, Sigmund Khevenhüller von Aichelberg became its feudal lord, and in 1571, Georg Khevenhüller acquired the castle.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Burgruine_Weidenburg3.JPG
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: 46.6478, 13.0568