The Oslo opera house is located on reclaimed land in the Oslo Fjord. Because it is located in the fjord it gives a nice early feel especially on foggy days as shown in the image. I have often been on the roof of the building when I visit the city since it is such a nice place and one of the only buildings that I know of where the entire building is designed to use the roof as public space.  Because the roof is a continuous slope for most of it the building has also been utilized for larger concerts where a large barge is utilized as a stage and the roof is filled by the audience as is seen in the second image.

I personally have never attended an event in or on top of the building, but since the roof is public access, I often use it as a meeting place when meeting friends and family in the city. Additionally, I have also sometimes used the building as a place to do base jumping into the fjord since it is vertical on one side and has an easy slope to climb back onto on the other side. Every time I visit the building I enjoy walking on the beautiful marbled roof and just looking out over the peaceful fjord. Since the building is located on reclaimed land it feels like you have walked out of the traffic of the city even though the city center is just across the street.