The small mount of Atashgah (Fire temple of Isfahan) with a height of about one hundred meters is located at the end of the street of Atashgah, 8 km west of Isfahan and near Zayandeh Rud River. There is an octagonal brick room on top of this mountain, which, despite being brick, has been protected from natural disasters for centuries. This chamber probably belonged to the Sassanid period and was Zoroastrian shrine, Although it was used to be a fort too.
In addition to a single room at the top of Atashgah mount, there were a series of old buildings and roads and probably tunnels next to this room down to the hill, of which only remnants are now available.
This complex has an ancient historical background. Mount Atashgah is said to have been a sacred place and burial place of the Prophet Tahmurth, who lived around the sixth century BC. It also has a secret tunnel to Khomeini Shahr and was considered one of the most important centers for keeping treasures during the invasion of Iran by Alexander the Great.
The building texture of this complex is made of brick layers. Between the two rows of bricks, a thin layer of straw (brought from the river) was placed to increase its strength.