Takht-e Soleyman, Iran - The site includes the principal Zoroastrian sanctuary partly rebuilt in the Ilkhanid (Mongol) period (13th century) as well as a temple of the Sasanian period (6th and 7th centuries) dedicated to Anahita. The site has important symbolic significance. The designs of the fire temple, the palace and the general layout have strongly influenced the development of Islamic architecture.
Sasanian, Firuzabad tower / Ardashir fire tower ruin. http://www.cais-soas.com/CAIS/Images2/Sasanian/Gur_Firuzabad/Firuzabad_Tower.jpg
nain iran -
قلعه دختر فیروزآباد
BABAK CASTLE, near Kalibar City, Iran. Also known as The Immortal Castle. Built atop a mountain 2300-2600 meter high and surrounded by gorges as deep as 400 to 600 meters, this castle is believed to belong to the Parthian dynasty and modified under the Sasanid dynasty. To reach the castle, one has to trek a tortuous and narrow passageway and then cross a corridor-shaped temple 200 meters in length.