Time and time again, the Derbyshire poet and climber Helen Mort is drawn back to the Peak District's Stanage Edge, famed for its millstone grit. Deeply satisfying to ascend, she reflects on how the millstones carved in situ were transported to mills around the UK. That is, until the fashion for white bread led to the bottom dropping out of the market, when British millers adopted the use of French millstones that didn't stain the flour a dull grey colour. Hence the rather surreal presence of finished millstones littering the cliffs below Stanage Edge, today a symbol for the Peak District National Park.

This is the second of this week's five essays in which writers reflect on how places that matter to them are shaped by the underlying geology.

Helen's latest collection of poems, 'No Map Could Show Them', celebrates the role of women in climbing, many of them overlooked pioneering Victorians who scaled the Alps in their hooped tweed skirts.

Producer: Mark Smalley. Show less