For Ireland researchers. A collection of digitized maps of Dublin and Ireland, viewable in Google map format, a revised and improved townland database, scans and extracts from a number of directories, a database of Catholic parishes as they were during the mid 1830s, Catholic and civil parish links for over 1,000 parishes, and map coordinates to over to 2,000 churches and chapels. All free to access....
http://www.swilson.info
Some interesting background and maps about Irish towns in the 18th Century from the Royal Irish Academy
https://www.ria.ie/towns-eighteenth-century
A fascinating collection of large scale 19th century maps for almost 150 cities, towns and villages in the Republic of Ireland. Digitised as a partnership between Ordnance Survey Ireland and University College Dublin.
http://digital.ucd.ie/view/ucdlib:40377
The Down Survey of Ireland was taken 1656-1658 to measure all the land to be forfeited by the Catholic Irish. All surviving copies of these maps have been brought together and digitised on the Trinity College, Dublin website.
http://downsurvey.tcd.ie/index.html
Free historical maps of Australia, London and some other parts of the UK. The site also includes some maps of Gallipoli.
http://archivemaps.com/mapco