old-maps.co.uk is a good site for maps from around 1850/60 to the 1920s or 30s
Cottage names are often marked as are hospitals, churches, halls, farms etc. Useful for finding where precisely under the A74 those little cottages were!
I also use google maps for nowadays - did you know the States , Australia, Japan & various bits of Europe have 'Street view" which allows you to see 360' views of the roads?
Eccles