Sixty-four people, mainly children, were drowned in the River Don in Masbrough, Yorkshire, on 5 July 1841 when the launch of a boat went wrong.
Mather Lane Mills
Former complex of cotton mills built on the banks of the Bridgewater Canal in Bedford, Leigh in Lancashire, England.
Matthew Murray
Matthew Murray was an engineer born in Newcastle on Tyne who became known for improving steam engines and building the first commercially successful steam locomotive.
Maud Foster Windmill
Seven-storey, five-sail tower mill close to the Maud Foster Drain, from which she is named, in Skirbeck, Boston, Lincolnshire.
Milton Court
17th-century country house in Dorking, Surrey, now converted to office accommodation.
Mine boat
Boats built to transport coal from the Duke of Bridgewater's pits in Worsley
Mining disasters in Lancashire
Mining disasters in Lancashire in which five or more people were killed occurred most frequently in the 1850s, 1860s and 1870s.
Minsden Chapel
Grade II listed ruined 14th-century chapel near Preston, Hertfordshire, reputedly haunted.
Model village
Type of mostly self-contained community, built from the late 18th century onwards by landowners and industrialists to house their workers.
Moorland
Dominant landscape of Britain's uplands, including many of its national parks.