Hopton landowners heavily involved in the nearby Wirksworth lead mining district, had the Via Gellia built to connect Cromford and Grangemill in the late 18th century. Various cottages and farm buildings pre-date Arkwright's time, but a large part of the village was built to house the mill workers. One source states that these are now considered to be "the first factory housing development in the world". Employees were provided with shops, pubs, chapels and a school. Willersley Castle, now a Grade II* listed building, was also built by Richard Arkwright in 1791; after a fire in 1792, it was rebuilt and occupied by his son Richard Arkwright junior starting in 1796. In the early 1800s, Scarthin Nick was "blasted through with dynamite to make way for what later became the A6, thus annexing the Arkwright industrial mill complex on the east side of the main Derby road and the Market Place and village at the bottom of the hill which climbs steeply westward towards Wirksworth, on the other". The 20th century saw the development of council and private housing. Dene quarry, currently operated by Tarmac Ltd for the production of aggregates and roadstone, was excavated to the south west of the village from 1942 onwards. In December 2001 a corridor from Masson Mill in Matlock Bath to the Silk Mill in Derby and including the mills in Cromford, Milford, Belper and Darley Abbey was declared the Derwent Valley Mills World Heritage Site. Masson Mill was described by the Peak District Online in 2006 as "perhaps the most prominent of Arkwright’s constructions ... and still in use today as a heritage site museum and retailer outlet". Cultural references The 1931 novel Saturday Night at the Greyhound by John Hampson takes place over the course of one evening in the bar at the Greyhound Hotel, Cromford. In late 2006, Anand Tucker used certain parts of Cromford, including its historic bookshop, for his film And When Did You Last See Your Father?, based on the autobiographical memoir by poet Blake Morrison. Colin Firth plays the adult Blake, with Jim Broadbent cast as his dying father. An industrial site in the German town of Ratingen is named Textilfabrik Cromford after Cromford, as this is where the industrial pioneer Johann Gottfried Brügelmann in 1783 erected the first factory outside England, using Arkwright's factory as an archetype. The factory today forms part of the Rheinisches Industriemuseum.