Just a short word to recommend the excellent 'Google Earth' site my stepson recently introduced to me. Basically, one can zoom into any spot on earth and download the resulting image. I have compiled an album in the gallery section of the most visible Roman sites from the air, Amphitheatres, theatres and Hippodromes. I find it heartwarming to see that many of these structures appear to be utilised even now. Its immense fun panning round the Meditteranean world, zooming in on cities and spotting these sites. I'm sure I havent got them all yet...!