The Akershus castle was the last big thing on my list of things I wanted to see. Just about everything is within walking distance in Oslo, so I followed some signs and made my way towards the castle.
On the way I stopped at the Opera House again and got the coolest hot chocolate ever. It was chocolate on a stick that you stirred into frothed milk. Wasn't too sweet or bitter, and kept me warm enough for the rest of the walk. It was also basically my lunch.