The Map images resource from the National Library of Scotland allows you to access and view over 48,000 maps as high-resolution, colour, zoomable images. The maps date between 1560 and 1961 and relate primarily to Scotland, though there are a small selection of maps of England, Ireland, Great Britain and Belgium.
With around two million cartographic items, the NLS map collection is the largest in Scotland and one of the biggest in the world. Holdings cover all parts of the globe, through some 700 years, from medieval manuscript maps to current digital mapping. If you cannot find what you are looking for online, it may be available in print.