The remains of the Castle can be visited
Feldsberg Castle

The predecessor building of Feldsberg Castle was the Hohenburg above Feldsberg. Feldsberg Castle was built as a simple Romanesque complex in the middle of the 12th century. The first documented mention was in 1189 by Hainricus de Veldisberc, a Salzburg ministerialis. The respective castellan was also responsible for jurisdiction until the end of the 16th century.
Feldsberg came to the Salzburgers through a donation from Bishop Altmann of Trent in 1142. In 1232, Count Meinhard of Gorizia sold the estate of Premersdorf near Feldsberg to Archbishop Eberhard of Salzburg, but took it back as a fief. He was probably also enfeoffed with Feldsberg Castle at that time, to which the Gorizians later claimed ownership rights. It was not until 1252 that Count Meinhard III had to commit to returning the "castrum Veltsperch" to Salzburg. Feldsberg always remained a bone of contention between Salzburg and Gorizia in the subsequent period.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Lurnfeld_Feldsberg_02.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: 46.8411, 13.3950