The Piece Hall, in Halifax, West Yorkshire, is a unique Grade 1 Listed building of extraordinary significance. It is one of only two fully intact cloth halls in Europe, and the only one in Britain. Built in 1779, it is a supreme example of pre-industrial Georgian architecture.
SE0925 : Dean Clough, "D Mill" Dean Clough is indeed a wondrous complex. The best view of all is from the North Bridge Flyover. This is barred to pedestrians so don't blame me if your master shot gets you arrested. A half way decent walk round this complex to get pictures is a couple of hours and probably a couple of miles too.