Ditherington Flax Mill. View of the Maltings from St Michael's Street in December 2018. The Ditherington Flax Mill, promoted as the Shrewsbury Flaxmill Maltings, is a flax mill in the county town of Shrewsbury in Shropshire, England. It is the world's first iron -framed building. It is also seen as the world's first skyscraper, often being ...