Over 8,000 crocheted afghans covered the steps of the Helsinki Cathedral in Finland. Often, Yarnbombing is done for charity or a cause. The Helsinki Cathedral yarnbombing installation was done in an attempt to break the Guinness World Record for the largest crocheted patchwork quilt in the world and then the quilts were donated.
Finlandia Hall... Helsinki's famous concert hall, designed by Alvar Aalto. It's still a neat place with cool architecture, but sadly the acoustics aren't great, so the Helsinki Philharmonic Orchestra recently moved to the new Helsingin musiikkitalo.
Suomen kansallismuseo, National Museum, Finland. Visited it by accident on a walk from downtown Helsinki to my hotel.