Schloss Kassegg, Historic castle in Sankt Gallen, Austria

Schloss Kassegg is a castle in the Gesäuse mountains at roughly 752 meters elevation, retaining a west tower and stone walls from its original farmhouse foundation. The structure now combines its historic core with hotel accommodations and dining facilities.

Construction was commissioned in 1886 by Georg Ritter von Aichinger, incorporating elements from an earlier farm called Kahsegger into the south wing. This conversion from agricultural land to residential building reflects the region's growing development during that period.

The castle's name comes from the Kahsegger farm, whose cellar and stone walls were built into the south wing. Since 2011 it has operated as Natur Hotel Schloss Kassegg, a three-star hotel for young people and families, so visitors today see a historic exterior combined with modern hotel use.

Schloss Kassegg reopened on 2 July 2011 as Natur Hotel Schloss Kassegg, a three-star hotel aimed at young people and families. It stands at 752 metres on the Erbsattel between Großreifling and Sankt Gallen, about 3.7 km west of Landl. The surrounding terrain is hilly to the north and mountainous to the south, so expect changing conditions.

Count Ottokar Czernin, Austria-Hungary's last foreign minister, bought the castle in 1918 and retreated there after the Sixtus Affair. He hunted big game in Africa in the 1920s and reportedly brought back a large gorilla that lived in the castle for several years. It died after drinking a bottle of Sidol silver polish found in the harness room.