The Derwent Valley Mills World Heritage Site stretches 24 kilometres north from Derby's Silk Mill to Cromford, following the River Derwent through a sequence of mill villages that grew up around Richard Arkwright's water-powered cotton-spinning frames in the 1770s and 1780s. Cromford Mill at the northern end is where Arkwright built his first water-powered mill in 1771 — the building survives and is open to visitors.
Walking or cycling the heritage trail between Derby and Cromford takes a full day and passes through Belper — where the Strutt family mills and workers' cottages form one of the best-preserved early industrial communities in England — and Milford, where the mill dam and weir still operate. The landscape is surprisingly beautiful: the Derwent cuts through wooded gorges and the mills sit in valley floors between limestone hills. This is the best way to understand what the Industrial Revolution actually looked and felt like.