Chimney Stacks, Auschwitz II – Birkenau, Poland. In 1941 Auschwitz II – Birkenau was built to accommodate more prisoners. It was ten times the size of Auschwitz I and was spread over a 425 acre site. Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website This site uses Akismet to reduce spam. Learn how your comment data is processed.