Persepolis has part(s) Tripylon
Darius I's construction of Persepolis was carried out parallel to that of the Palace of Susa. According to Gene R. Garthwaite, the Susa Palace served as Darius' model for Persepolis. Darius I ordered the construction of the Apadana and the Council Hall (Tripylon or the "Triple Gate"), as well as the main imperial Treasury and its surroundings. These were completed during the reign of his son, Xerxes I. Further construction of the buildings on the terrace continued until the downfall of the Achaemenid Empire. According to the Encyclopædia Britannica, the Greek historian Ctesias mentioned that Darius I's grave was in a cliff face that could be reached with an apparatus of ropes.Around 519 BC, construction of a broad stairway was begun. The stairway was initially planned to be the main entrance to the terrace 20 m (66 ft) above the ground. The dual stairway, known as the Persepolitan Stairway, was built symmetrically on the western side of the Great Wall. The 111 steps measured 6.9 m (23 ft) wide, with treads of 31 cm (12 in) and rises of 10 cm (3.9 in). Originally, the steps were believed to have been constructed to allow for nobles and royalty to ascend by horseback. New theories, however, suggest that the shallow risers allowed visiting dignitaries to maintain a regal appearance while ascending. The top of the stairways led to a small yard in the north-eastern side of the terrace, opposite the Gate of All Nations.
Grey limestone was the main building material used at Persepolis. After natural rock had been leveled and the depressions filled in, the terrace was prepared. Major tunnels for sewage were dug underground through the rock. A large elevated water storage tank was carved at the eastern foot of the mountain. Professor Olmstead suggested the cistern was constructed at the same time that construction of the towers began.
The uneven plan of the terrace, including the foundation, acted like a castle, whose angled walls enabled its defenders to target any section of the external front. Diodorus Siculus writes that Persepolis had three walls with ramparts, which all had towers to provide a protected space for the defense personnel. The first wall was 7 m (23 ft) tall, the second, 14 m (46 ft) and the third wall, which covered all four sides, was 27 m (89 ft) in height, though no presence of the wall exists in modern times.
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