Palace of Ardashir e Pāpakan, also known as the Atash-kadeh, is a castle located on the slopes of the mountain on which Ghaleh Dokhtar is situated on. Built in 224 CE by Ardashir I of the Sassanian Empire, it is located two kilometers (1.2 miles) north of the ancient city of Gur, i.e. the old city of Firuzabad in Fars, Iran. The building has three large domes, among the oldest examples of such large-scale domes in the world. From the architectural design, it seems the palace was more of a place of social gathering where guests would be introduced to the imperial throne.What is particularly interesting about this palace is that its architectural design does not exactly fall into that of the Parthians or even Sassanian category; the design is a unique design particular to architects of Fars. The palace was built next to a picturesque pond (on the bank of the western branch of Tangab River) that was fed by a natural spring. The spring is thought to have fed a royal garden, in the same way that Cyrus had his garden built at Pasargadae. The pond was tiled on its sides, surrounded by pavement for guests of the royal court to enjoy the evenings by.