There are more than 20 World heritage Sites in Iran.

List of World Heritage Sites in Iran (In order of registration date);

1. Naqsh-e Jahan Square
2. Persepolis
3. Tchogha Zanbil
4. Takht-e Soleyman
5. Bam and its Cultural Landscape
6. Pasargadae
7. Soltaniyeh
8. Bisotun
9. Armenian Monastic Ensembles of Iran
10. Shushtar Historical Hydraulic System
11. Sheikh Safi al-din Khānegāh and Shrine Ensemble in Ardabil
12. Tabriz Historic Bazaar Complex
13. The Persian Garden
14. Gonbad-e Qābus
15. Masjed-e Jāmé of Isfahan
16. Golestan Palace
17. Shahr-e Sukhteh
18. Cultural Landscape of Maymand
19. Susa
20. Lut Desert
21. Persian Qanat
22. Historic City of Yazd
23. The Ensemble of Historical Sassanian Cities in Fars Province (Bishabpur, Firouzabad, Sarvestan)
24. Caspian Hyrcanian mixed forests

 wikipedia.org