"The Gorge is known to be the location of the ancient King Road built by the order of Darius the Great, the Achaemenid King."
Darius the Great - the non-Muslim monotheistic Zoroastrian Monarch the Ayatollahs would like to forget.
He was the real originator of the phrase, "Achaemenid, I saw, I conquered."
Okay, I made that up.