Two sections of the former railway line from Langelsheim via Clausthal-Zellerfeld to Altenau have been converted into a cycle path. The northern section through the narrow valley of the Innerste, finely paved and almost completely car-free. For more information, see achim-bartoschek.de/details/ni3_14.htm?w The southeastern part of the railway route here: komoot.de/highlight/2788623?ref=whd