Lancaster Priory Web Site - A very useful site. Has information on the history of the Priory and the Castle with lots of pictures and a timeline.
Lancaster Castle - Lancashire County Council's site.
Old maps of Lancashire - Lancashire County Council has Speed's map of 1610, Yates' map of 1768 and Hennet's map of 1829 as well as 1:2500 first edition Ordnance Survey plans of c.1890 of several towns in Lancashire, and 1:10,560 (6 inch) plans of 1845 of Lancaster and Longridge.
MARIO - Maps and Related Information Online - many useful resources for the Lancashire local historian
A History of the Lancaster Canal
The Cumberland and Westmorland Antiquarian and Archaeological Society
Centre for North-West Regional Studies - Based at Lancaster University the Centre runs an annual archaeology conference, local history seminars and study days. It also has a range of publications dealing with the History and Archaeology of North-West England.
Hudson History - Publishers of Lancashire History Quarterly, Yorkshire History Quarterly and Industrial Heritage Journal.
Lancashire Local History Federation
Liverpool Museum Field Archaeology Unit
Time Team - The popular Channel 4 Archaeology programme.
Council for British Archaeology
BBC Online - History
Castles of Britain - a site dedicated to the study and promotion of British Castles.