The pilgrimage route to Nidaros Cathedral has been revived. Using Norwegian spelling, the route is known as Saint Olav's Way. The main, route begins in the ruins of Oslo's Old City (Gamlebyen) and heads north along the lake Mjøsa, up Gudbrandsdalen, over Dovrefjell and down the Oppdal valley to the cathedral. Oslo has an office to advise pilgrims, and the Trondheim cathedral has a pilgrim centre which awards certificates to pilgrims who complete their journey.