I am now back from Algeria. What you see above if the extraordinary gorge at Constantine/Cirta that I mentioned but couldn't show in my last post. Now you see why it struck me that this really made a difference to any experience of living or being brought up in the place, now or 2000 years ago.
Anyway, I had a great time in Algeria, if slightly strange in various ways. The Roman remains really are amazing, as you can see (that's Timgad and the arch had a bit of assistance from the French, but never mind).
It would be great to think that more people would be able to go and see them, but it is difficult, though not impossible, to get there independently. Some cruises stop in Algiers and there are some niche tours, I think. But during the site visits we made, we saw no other definite non-Algerians. If you get a window of a chance, do go.
More generally, I think one should only very tentatively pontificate about places one visits but doesn't really understand. And I have been only to a small strip of a country that is as big as Europe. So please take what follows in the humble spirit it is meant. (Another picture of Constantine below: restoration of French mansion blocks.)