Chak-Chak Introduction: Chak-Chak is the most important Zoroastrian pilgrimage site in Iran. According to legend, after the Arab invasion in 637 AD, Nikbanuh, the princess of the Sassanid Dynasty, fled here. Due to lack of water, she ordered her followers to dig holes from the cliffs of the mountains to divert water. When the water dripped into the cave, it made a "CHAK CHAK" sound. Her name From this.