There is a shrine for Zoroastrians In the desert mountains of Yazd province 35 km east of Ardakan, which is known as the shrine of Pir-e Sabz or Chak Chak. This shrine is in a shallow cave at the foot of the mountain, from the roof of which water falls in the form of drips, hence this place is named as Chak Chak, that means drop by drop.
The reason for choosing this place as a Zoroastrian shrine is due to the memory of the Sassanid princess named Nik Banoo, the daughter of Yazdgerd III, who took refuge in this place to escape from the Arabs. Every year from June 13 to 17, Zoroastrians gather in this place, and of course, apparently at that time, visiting this shrine will be forbidden for tourists.
Google map link of Chak Chak Zoroastrian Shrine