Combining Gothic and Romanesque architecture,
Durham Cathedral is one of the most majestic in Britain. But even this magnificent building has its imperfections - notably a deviant column in the south transept, regarded as a pleasing error. Dan Cruickshank discovers how sacred geometry and the art of decoding medieval buildings can explain the reasons for this anomaly.
Producer Ben McPherson ; Executive producer Basil Comely BBC BOOK: Britain's Best Buildings, by Dan Cruickshank , is available, L25