This month's (August) issue of National Geographic Magazine features a cover story about ancient Iran and Persia. Here is the intro from the full article.

"What's so striking about the ruins of Persepolis in southern Iran, an ancient capital of the Persian Empire that was burned down after being conquered by Alexander the Great, is the absence of violent imagery on what's left of its stone walls. Among the carvings there are soldiers, but they're not fighting; there are weapons, but they're not drawn. Mainly you see emblems suggesting that something humane went on here instead—people of different nations gathering peace fully, bearing gifts, draping their hands amiably on one another's shoulders. In an era noted for its barbarity, Persepolis, it seems, was a relatively cosmopolitan place—and for many Iranians today its ruins are a breathtaking reminder of who their Persian ancestors were and what they did."

Source: National Geographic