Hello,
There are some best places to visit in Iran. These are the followings:
1. Naqsh-e Jahan Square in Esfahan
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2. The Old City in Yazd
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3. The Tomb of Hafez in Shiraz
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4. Ancient Persepolis
5. The Bazaar of Tabriz
6. Alamut Valley and the Castles of the Assassins
7. Colorful Nasr ol Molk Mosque in Shiraz
8. Chak-Chak the holy place of Zoroastrians
9. Shaking Minaret and the abandoned village at Khanrnaq
10. Historical Houses in Kashan

Thanks