Burgruine Lichtengraben, also known as Burgruine Painburg, is a late Gothic water castle ruin nestled in a forest near Bad St. Leonhard im Lavanttal in the Wolfsberg district of Carinthia. Built after 1420 with significant structural expansions in the late 15th and early 16th centuries, the ruin's walls rise partly three stories high. Now under monument protection and privately owned, the castle represents an important example of late Gothic architecture in the Lavanttal region, standing approximately 200 meters north of Schloss Lichtengraben.
