The Altmühltal Panorama Trail (Altmühltal-Panoramaweg) follows the Altmühl river from Gunzenhausen to Kelheim through meadows dotted with junipers and romantic rock formations. Along its 200 km you will find historic cities, ancient castle and splendid palaces as well as Celtic and Roman remains (https://en.naturpark-altmuehltal.de/routen/altmuehltal-panoramaweg-149/).