On the eastern slope of the Mond mountain range in Bushehr province and near the village of Heydari, there are hand-made caves in the heart of the mountain, which is related to a shrine or fire temple from the Sassanid and Parthian periods.
Inside the cave, a corridor has been dug to reach the temple chamber of this shrine. This historical monument is about two thousand years old. Because the main entrance to enter this historic cave is above ground level, in recent times, a series of stairs have been built for tourists to enter this cave.
Google map link of Mond Fire Temple