The remains of the Castle can be visited
Hieburg Castle

The Hieburg castle ruin, a former fortress, is situated in the Oberpinzgau region of Salzburg, Austria, near the Gerlospass.
History+
The origins of Hieburg, initially named Mairhofen, date back to the late 13th century. In 1290, the castle was first documented when Walter von Neukirchen was mentioned as its owner. Friedrich von Velben, who owned the castle until 1297, had it expanded into a fortress, featuring a high curtain wall, wooden structures, and two tower chambers. In 1544, a lightning strike caused damage to the complex, which was subsequently repaired. Following further fires and several changes of ownership, the castle was declared dilapidated by Christoph von Küenberg in 1620. Another fire in 1661 led to Hieburg being left to complete decay.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Hieburgbergfried.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: 47.2470, 12.2445