Just noticed this old post too. My Holts were English... moving from Maine to Minnesota in the 1850s... while researching this family... William Henry Holt. I stumbled across another William Holt from Norway living in the same part of Minnesota. I am trying to remember, but I think he may have build an hexagonal shaped barn... it has been a long time. As I recall I kept stumbling across Norwegian Holts as I searched the MN census records.