Adobe-made buildings around Kermanshah and Ghazvin be long to 8th and 7th millenniums B.C. Shahr e Sukhteh (Burnt town) which had contiguous buildings, belongs to the third millennium B.C. Ziggurat (a brick-made building in Cheg
hazanbil) has specifc features. It is for the end of the second millennium B.C. The 17 stone palaces of Takht e Jamshid, which belong to Hakhamaneshi Era, reveal high value of world architecture and unique ways of building. Arch buildings of Ashkani Era, including temples and palaces, have brought some advan tages for Iran’s architecture. Unique architecture of Sassanid dehiscent Era (for example bases of arch buildings, their plan and frameworks, their surfaces, arches, and domes) resulted In different buildings (such as palaces, fre temples, inns, etc) In all, many of worthy methods of “pre-Islam” architecture, is the basis of “post-Islam” architecture in Iran.