Helsinki Card is free to visit, but the special exhibition needs additional fees. We went to Barbie's special exhibition, children are free to see, adults 3 Euros. Bags need to be deposited, and they are free. They can be photographed. Starting from the underground floor, the tour mainly talks about Finland's origin and history and culture. There is a children's situational experience area on the 4th floor of the museum. Children like it very much and they don't want to go. The museum opens at 11 o'clock. It's no use going early.