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Oslo Opera House - Wikipedia
Oslo Opera House: please walk on the roof - Visit Norway
The Norwegian Opera & Ballet - Operaen.no
Oslo Opera House / Snøhetta - ArchDaily
About the Opera House - Operaen.no
Oslo Opera House: A Modern Scandinavian Masterpiece
Oslo Opera House - Schedule, prices & location
Oslo Opera House: A Landmark of Oslo, Norway - YouTube
Norwegian National Opera and Ballet - Snøhetta
Practical information - Operaen.no