The intention of this essay is to put the light on and to discuss if there is a connection between a pre-Christian creation mythology and naked rocks on prehistoric sacred places in Scandinavia. Archaeological as well as historical materials are studied. The historical material is mostly from Snorre Sturlasons Asasagan with the explanation of the creation of the world. In this story the world was built from the body of a killed and deposited giant named Ymer. Almost the same myth is told in all Indo-European countries. Asasagsan tells about the Gods and the people in the late iron-age. Sanda in Fresna socken and Helgö in Ekerö socken, both in Uppland and both in activity in late iron-age are used as archaeological example of places where naked rocks are used as some kind of altar for rites.