Old Maps - Online Ordnance Survey maps of 1846-1899 covering England, Scotland and Wales at 1:10,560 scale.
Skylibrary - A UK-based aerial photography company with a large archive of UK aerial photographs.
UK Perspectives - A large concise collection of aerial photos of the UK
United Kingdom - Map of the administrative divisions as they stood in 1988, from the Library of the University of Texas.
AskMaps - Has index of streets and city monuments ready for printing.
Map24 - Full minor road and street level coverage for the whole of Great Britain. Enter a UK address to access maps. Zoom and roam features.
Ordnance Survey - Britain's national mapping agency. Historical, touring, landline, superplan, GB, Landranger, Explorer, road and street maps.
Your Old Maps Online - Scans of out of copyright maps and etchings, organised by country and county.
UK 360s - Panoramic photographs from around the British Isles by Craig Wilkinson.
Francis Frith Collection - Photographs of 7,000 towns and villages taken between 1860 and 1970. Available as prints and in book collections. Thumbnail views, watermarked enlargements and ordering details.
Election Maps - Free constituency, county, borough and ward maps. Includes ability to select overlays required between the different types of administrative boundaries, and to determine which area a postcode resides in.
Google Maps - Zoomable maps focused on an address or post code. Maps can be searched by business category. Also provides driving directions.
Celtic Shadows - Photographic tour of Northeast Scotland and England from a native's viewpoint.
Old Ordnance Survey Maps - Scans of a selection of the Popular Edition (1920s and 30s), 1 inch to the mile, England and Wales, Ordnance Survey maps displayed using the Google Maps interface.
The Work of W.A. Green - Pen and ink drawings made 1925-1983 of historical buildings in the Midlands and Mid-Wales.
Geograph British Isles - The Geograph project aims to collect a geographically representative photograph for every square kilometre of the British Isles.
UK Multimap - Online maps of the UK, down to street level. Search by street name, postcode or placename. Based on OS data.
Old Maps - Maps of towns in England, Scotland and Wales as they were in the 1950s.