Iranian culture has long been a predominant culture of the Middle East and Central Asia, with Persian considered the language of intellectuals during much of the second millennium CE, and the language of religion and the populace before that. The Iranian New Year (Norouz) is celebrated on March 21 from Spain in the west to Kazakhstan in the east. It is celebrated as the first day of spring. Norouz was nominated as one of UNESCO's Masterpieces of the Oral and Intangible Heritage of Humanity in 2004.[98]

Iranian customs and traditions often seem complex to the foreigner, but after further study reveal a rich and often intensely warm characteristic. For example, respect for the elderly and hospitality for foreigners, remain highly visible parts of Iranian etiquette, while the highly familial nuclear structure of Iran's society is in stark contrast to many western societies.

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