Oslo Opera House - Oslo Opera House is without question one of the most beautiful modern buildings…read moreI have visited anywhere in Europe. The architecture is outstanding, and the opportunity to walk on the roof makes the visit even more special. The surrounding area is beautifully landscaped and offers many excellent spots for relaxing and taking photographs. The building feels impressive and monumental while still maintaining an elegant appearance. Even without attending a performance, it is well worth visiting to experience the atmosphere of one of Oslo's most iconic landmarks. Operataket Observation Deck - The free observation deck on the roof of the Opera House is, in my opinion, one of the places that nobody should miss when visiting Oslo. The climb is easy and the reward is a stunning panoramic view of the city, the fjord and the harbour area. I especially liked that the roof is freely accessible and provides plenty of space for walking, relaxing and taking photographs. The combination of the building's modern architecture and the surrounding scenery creates a truly unique experience.