The ruin is positioned on the western side of the schober. The ruin was built from "Konrad von Kahlham " in 1259. Since then he called hisself "von Wartenfels". He sold everything also the tithes to the archbishop of Salzburg in 1301 for 180 pounds.
The bishop setted up a court in the castle. This court was responseble for Thalgau, Fuschl, Faistenau and Abersee.
The community of Thalgau started to built a new court in the center of Thalgau and so the decay of the castle Wartenfels started.
After many years Thalgau decided to renovate the ruin. Responsible for the renovation was a architekt from Thalgau. The building work started in 1981.
In nowadays you cna see the ruin from Thalgau, the walls are now mounted.