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3 Metal discs found in the Grasdorf Pictogram, Germany 1991 The farmer Werner Harenberg woke up early in the morning of July 23 1991 to discover Germanys first really spectacular crop circle near the village of Grasdorf, Lower Saxony in the historic Teutoburger Wald Area, not far from Hannover, and indeed not far from the prehistoric site of Externsteine,