The Muir Ramble Route was created by Peter & Donna Thomas and inspired by John Muir's famous 1868 walk from San Francisco to Yosemite.  The Thomas' researched Muir's original route, and created a roughly parallel route that stays mostly off of busy roads.  They published a book about the route.  The Route website says:

Galdhøpiggen is the tallest mountain in Norway, Scandinavia and Northern Europe, at 2,469 m (8,100 ft) above sea level. It is located within the municipality of Lom (in Oppland), in the Jotunheimen mountain area. The route is from Spiterstulen tourist station to the top and back.

The fastest times for Galdhøpiggen have been set by skiers.