Although we didn't visit the museum, it was still impressive to see the ski jump. We took the T-1 train (T Bane) up to the Holmenkollen station (very easy system to use) and enjoyed the 700m uphill walk from the station up the jump itself. Even though it was a foggy day up there, it was a cool sight. On the way back to the station we found a Game of Thrones throne made of skis!
From the train ride, it was interesting to see how the (likely rich) Norwegians live in the hilly suburbs.
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