Derwent Valley Mills is a World Heritage Site along the River Derwent. The modern factory, or ''mill'', system was born here in the 18th century to accommodate the new technology for spinning cotton developed by Richard Arkwright.
The building of industrial establishments in a rural landscape meant it was necessary to construct housing for the mill workers. Thus, new villages developed around the mills; these still exist today and can be visited as they form part of the site.
At the Working Textile Museum at Richard Arkwright''s Masson Mill, there are approximately 680,000 bobbins on display.