Seyed Mehdi Mousavi Kouhpar - Associate Professor of Archaeology, Tarbiat Modares University. Tehran. Iran.
Alireza Zabanavar - PhD Candidate in Archaeology, Islamic Azad University of Science and Research Branch. Tehran. Iran.
Solmaz Ahmadzadeh Khosrowshahi - PhD Candidate in Archaeology, Tarbiat Modares University. Tehran. Iran.

Tang-i-Chakchak complex is located at eastern Fars Province. As one of the biggest religious Sassanid architectural complex, it consists of two main architectural spaces including a Chahartaq or a domical squared space. One of the two main spaces, with a square plan, considered the place of maintenance of the holy fire. Present paper attempts to suggest a plan of the structure of the religious architecture, during Sassanid period, following investigating architectural square space of Tang-i-Chakchak in comparison to similar structural spaces, in order to understand historical and realistic function of the building. Purposefully, it is a fundamental research, with a historical and descriptive-analytical methodology and nature, while data collected bibliographically and following fieldwork. The conclusions present a modern classification of the sanctuaries attributed to Anāhitā during Sassanid period, consisted of two different religious architectural spaces, furthermore, there is an introduction of the square architectural space of Chakchak as a sanctuary that attributed to Anāhitā. Some of the religious spaces relate to Arədvī Sūrā Anāhitā the ancient Zoroastrian goddess, and some other structures connect to Anāhitā, with Mesopotamian origin. The architectural spaces indicate various religious attitude for different reason, not a development during Sassanid period. It appears that there was an attempt to diminish the latter, for their non-Zoroastrian origin during late Sassanid phase. Present paper potentially is Important for suggesting a new structure of the sanctuaries of Anāhitā, in addition to revising earlier theories and assigned structure to Anāhitā, which explain various religious attitude within Zoroastrian framework during Late Antiquity of Iranian history.