Something @ello users (especially those who are into design and architecture) will surely like: Oslo Opera House. Situated in Bjørvika, the theater has been completed in 2007 after 5 years of work, with a final cost of more than 700mln $. Besides all, it's a truly breathtaking building, which rises from the water like an iceberg with its bright white structures and sharp lines. Moreover, the contrast between the interior and the exterior parts (where you can walk wherever, roof included) is supreme.
If you're going to Oslo you should definitely check it out!