In Oslo it was not so, as we were led by Norwegian friends. Although it was a short stay (only three nights), on an extended stop over between Latvia and Portugal, we ended up seeing almost everything, since, despite being the capital of Norway, it is not a very big city.
Oslo has a small, classic, historic center and lots of contemporary architecture. One of the examples, unavoidable in a visit to the Norwegian capital, is the Opera House, designed by the Snøhetta architecture studio. It is a building that can be traversed, being an extension of the city, a hill built by the man that offers us a privileged view to one of the recesses of the fjord. Inside we find a “wave” in wood, that makes the access to the auditoriums, and that symbolizes the contact of the city with the water.