"Iran should not have existed on the map of history for centuries, for millennia. It should have been wiped out completely, because it is on the crossroad of all the civilizations and the battle field of many armies".
Prof. Peter J. Chelkowski
I was watching this, an hour long journey through Iran ancient history and the words above took me by surprise. I don't know how much of a help such an input could be to finding out the real reasons for Iran falling into the third world.