The routes in the high altitudes of the Harz go up the Wurmberg and the Achtermann with views of the Brocken, and through deep valleys and rocky scenery.
The GPS data for all the routes starting from this location can be found here [9 KB] [ZIP: B1, B2, B3, B4]. In the description of each of the individual mountain bike routes you will also find a link to the GPS data for that route.