One of the first things you should do in Oslo is to go hunting for art in the parks and streets. Some of the largest parks have sculptures you can enjoy for free, like the Vigeland sculpture park and Ekebergparken. In addition, there is both beautiful street art and many world-class sculptures around town.
If you want to go to a museum in Oslo, you usually have to buy a ticket. But most art galleries show their works for free, and some museums have free admission for their permanent collections or on selected days.
Oslo is packed with historical sites that you can still experience today. Discover rock carvings from the Stone Age, ruins from the Middle Ages, and buildings from the Dano–Norwegian Realm on your way through the city.
The Oslo Pass gives you free entrance to museums and other attractions, free use of public transport, and discount on everything from sightseeing tours to restaurants. The pass is valid for 24, 48 or 72 hours. Get it online, as an app, or at various places in Oslo, including the Oslo Visitor Centre, where they will tell you everything you need to know about the city.