Dont know if its too late now, but this should be enough:
Naqsi-i Rushtan
archaeological site in Iran, best known for its Achaemenid tombs
pre-Achaemenid reliefs and graves show it was already important when Darius ordered his monumental tomb to be carved into the cliff (Huseyn Kuh).
tomb is known for the king’s “autobiography” – DNa and DNb – central though is that Darius wanted to rule according to justice. Sealed until Alexander overthrew empire and looted.
DNa – describes countries he ruled/conquered (26 – tribute, held his law, listened to him) – Parthia, Aria, Bactria, India, Scythians, Babylonia, Assyria, Lydia
DNb – Ahuramazda gave Darius wisdom to be king, he is a strong ruler – own opinion, decisions, fair, good fighter.
later similar tombs were added – no inscriptions, cant be ID’d with certainty but must have belonged to Darius son and successor Xerxes, Artaxerxes I and grandson Darius II. 3-9 people in each, later kings probably buried in Persepolis.