Paul Hardy sent us this picture of a map of Roman Bedford
“Here’s another map in the wild. It’s in the centre of Bedford (UK), and the photo is taken looking down from the remains of the medieval castle mound. The map is of Bedford in Roman times. It would normally be surrounded by a lush green English lawn, but this was taken in what was the hottest, driest July for many years, which may explain the droopiness and lack of interest of passers-by”
For a little more info on Bedford Castle have a look at Wiki