The Museum has regular new temporary exhibit but for a visitor to Portland what you want to see is on the third floor. This is a permanent exhibit about the history of Oregon. The whole floor and exhibit were redone in 2019 so it now has a contemporary look. There is a time line that flows through the exhibit like a river with eddies and backwarters where you find more detailed information. This gives you an overview of Oregon’s history and you may need a half a day to take in all of the museum.