The Oslo Opera House, which took five years to build, is located on the shore of Oslo's Bjrvika area, near the Central Station. Its architectural style is like a boat, facing the Oslo Fjord. It is the host of Norwegian operas and other cultural activities. The building itself is a work of art, made of marble and glass, with a concise, modern and magnificent shape. It is the largest cultural building in Norway after Nidarosdomen Cathedral, built in Trondheim in the early 14th century. Sometimes there are free open-air concerts outside the opera house. You can sit on the platform and enjoy the sea scenery while enjoying the music. In the evening, you can also climb on the roof of the opera house to get a glimpse of Oslo at night.