Detail of an outer wall of the Kaba Zartosht at the kings’ tombs in Naqsh-e Rostam, Iran, near the king’s palace in Persepolis. There is debate about what this building was used for, including a fire temple, an ancient calendar or a treasury. The four rock tombs located here are said to be those of Darius II, Artaxerxes I, Darius I and Xerxes I, early Persian rulers.
