From NLS News
Detailed maps that offer a fascinating glimpse into how every area of England and Wales developed from Victorian times to the 1950s are now available free online.
The six-inch to the mile series of Ordnance Survey maps show how towns and cities have spread into the countryside and how the road and rail network developed. Individual buildings and streets can be identified clearly and smaller features can be seen including post boxes, bollards on quaysides and mile posts. The maps can be viewed over time for each place of interest.
The maps also show all place names recorded by Ordnance Survey, including all street names in towns, and all smaller farms, hamlets and villages. The website allows viewers to zoom on the maps to pick out the detail they are interested in.
The maps were surveyed for the whole country twice — first between 1842-1893 and then between 1891-1914. They were subsequently updated regularly for urban or rapidly changing areas from 1914 to the 1940s. The result is that, for many towns there are three to five editions of mapping between the 1840s and the 1950s
Direct to Additional Map Info, Lists, Etc.
See Also: Old Maps Online Database
20 organizations and institutions from around the world contribute to this wonderful interactive resource that launched in 2012.