Prehistoric Iran
The oldest evidence of humankind in Iran Plateau has been unearthed in Kashafrud River region in Khorasan province dating back to 800 thousand years ago.
The Historic Iran
Historic Iran era dates back to 2500 years ago i.e. the time of the Achaemenid dynasty followed by Seleucid, Parthian, and Sassanid dynasties.
Iran after the Advent of Islam
It is a period of time began with the Arabs’ invasion of the country in 642 B.C. and the Iranians gradually converted to Islam; the period which has been continuing up to the present.