If you're traveling by bus or train, you'll most likely pass through Rotuaari. This terminal is a major transportation hub for the area and an attraction in itself.
This transportation hub in Oulu comes recommended by many travelers, so make a spot for it on your schedule. However, don't end your sightseeing there. There are many more attractions waiting for you to enjoy after Rotuaari. Nallikari, University of Oulu, and Oulu Market Square are close by.