Situated just north of downtown, Grefsenkollen provides great views of Oslo, the fjord, Holmenkollen and the surrounding forests. From the top there are many opportunities to hike further into the beautiful forests of Nordmarka. Difficulty level: Easy Distance, one way: 3.1 kilometres (1.9 miles) Elevation gain: 140 metres (460 feet) Time consumption: 1–1,5 hours Public transportation: Take bus 31 (Grorud T) from Jernbanetorget to the stop Årvoll senter. Switch to bus 25 (Majorstuen) and hop off at Grefsenkollveien. Read more information about this adventure on Outtt. Download the Outtt app from Google Play or App Store for more outdoor activity suggestions in Oslo.