Gudbrandsdalsleden is one of the Saint Olaf pilgrim route in Norway which end up by the thomb of the king Olaf in Nidaros Cathedral. The name means the path of Gudbrandsdalen, stretches from Oslo to Trondheim, a 643 km well-marked pilgrim path with beautiful and varied landscape. The first part from Oslo to Lilehammer is a bit monotonous and goes on the gravel and asfalt road and that is why is often skiped. The most beutiful part starts in Lilehammer. Along the path you can experience soothing agricultural landscapes, wander across the mighty Dovrefjell plateau and enjoy the tranquility of the lush Trøndelag nature.
More information you can find on official websites:
https://pilegrimsleden.no/en/trails/gudbrandsdalsleden
or
https://en.wikipedia.org/wiki/Pilgrim%27s_Route
