It always amazes me when I come upon a long, long stretch of very straight road in Ireland. If it was in England you'd definitely think to yourself that 'the Romans musta built this', but you know they didn't. It is also obvious that the route is ancient, so some one else must have built a very straight track there a long time ago.

When you see the tracks the Iron Age bog roads took - straight as a very straight arrow - you get the feeling that those road builders didn't like to mess around either.

I think I saw someone suggest that, right across Europe, most of the Roman roads were built upon the pre-existing roads of the Celts, but I can't remember where I read it.