From the outside, the Opera House is a white, sloping stone roof, rising from the Oslo Fjord; its beautiful marble and granite roof looks like a water glacier; the front is full of solar panels, which are said to meet all the power needs of the theatre. We entered the lobby from the main entrance and saw a huge open house with extremely concise interior decoration. It was a place for the audience to rest, with bars and restaurants. On the roof of the opera house, you can enjoy Oslo's cityscape and the scenery of the fjord, and then come down from the right.