Palace of Ardeshir Babakan

The Palace of Ardashir Pāpakan, also known as the Atash-kadeh آتشکده, is a castle located on the slopes of the mountain on which Dezh Dokhtar is situated. Built in AD 224 by King Ardashir I of the Sassanian Empire, it is located two kilometers north of the ancient city of Gor, i.e. the old city of Artakhsher Khwarah/Khor Adashir/Gor Adesheer in Pars, in ancient Persia. The ancient city where the palace is located, was renamed "Peroz" after Ardashir established the Sassanian Empire by overthrowing Ardavan, the last Parthian king. After the Arabian conquest, Peroz was called Firuz, and the name remained. The modern city of Firuzabad is hence, of important significance in Persian history.

Source: Wikipedia