The Osterburg is a castle located conspicuously on a hill in the middle of the town of Weida in the county of Greiz in the German state of Thuringia.DescriptionIts 54-metre-high bergfried is the third highest and one of the oldest surviving bergfrieds in Germany. Above its second array of battlements there is a watchman's parlour, which accommodated a watchman until 1917. On the terrace there is a monument which records that this was the furthest south that the ice sheet came in Germany during the Elster glaciation. Literature Henriette Joseph, Haik Thomas Porada : Das nördliche Vogtland um Greiz. . Böhlau, Cologne etc., 2006, ISBN 3-412-09003-4. Rosemarie Bimek, Heinz Fischer, Roland Gehring, Dr. Egbert Richter, Kurt Häßner, Dieter Hauer, Günter Kummer: 800 Jahre Osterburg, Weida in Thüringen. Stadtverwaltung Weida in Thüringen, Heimatmuseum Osterburg, Altenburg, 1993, pp. 1–52.