

Persia

Huge impact on teh world through teh Arabs, Ottomans, even Mongols and Greeks. In teh post-Egypt/Sumeria/Indus Valley age, it was one of teh four cultural fountainheads of teh ancient world.
And of course Zoroastrianism and monotheism hugely influenced world religion.
Zoroastrianism is uniquely important in the history of religion because of its possible formative links to both Western and Eastern religious traditions. As "the oldest of the revealed credal religions," Zoroastrianism "probably had more influence on mankind directly or indirectly, more than any other faith."
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