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Vom Bochumer Ehrenfeld bis zur Tetraeder-Halde in Bottrop sind es mit dem Fahrrad genau 26,73 km. Über die Erzbahntrasse bis zum Grimberghafen gelangt man auf der Route der Industriekultur zum Nordsternpark und von dort zur Halde mit der großen Tetraeder-Pyramide aus Stahl.
Ähnlich wie die Holzypramide in Waltrop ist der Tetraeder begehbar. Weiterlesen