Excellent visit, the best part was outdoors; the Opera House has a fully walk-able roof, offering splendid views across Central Oslo. See full review on TripAdvisor
Definitely worth going up the roof for a nice view of the city. This building is very close to Central Station and you can easily walk between the two. Of course, if you have the time (and the money... See full review on TripAdvisor
Impressive building next to the fiord. No words to describe it.
I strongly recommend to visit it: you cannot go to Oslo and don't go to visit them. See full review on TripAdvisor