The Great Persian Empire 2500 Year Ago

Persepolis Old Persian Pārsa, Takht-e Jamshid or Chehel Minar) was the ceremonial capital of the Achaemenid Empire (ca. 550-330 BCE). Persepolis is situated 70 km northeast of the modern city of Shiraz in the Fars Province of modern Iran. In contemporary Persian,
the site is known as Takht-e Jamshid (Throne of Jamshid) and Parseh. The earliest remains of Persepolis date from around 515 BCE. To the ancient Persians, the city was known as Pārsa, which means "The City of Persians". Persepolis is a transliteration of the Greek Πέρσης πόλις (Persēs polis: "Persian city").
Archaeological evidence shows thatthe earliest remains of Persepolis date from around 515 BC. André Godard, the French archaeologist who excavated Persepolis in the early 1930s, believed that it was Cyrus the Great (Kūrosh) who chose the site of Persepolis, but that it was Darius the Great who built the terrace and the great palaces.

Darius ordered the construction of the Apadana Palace and the Council Hall (the Tripylon or three-gated hall), the main imperial Treasury and its surroundings. These were completed during the reign of his son, King Xerxes the Great. Further construction of the buildings on the terrace continueduntil the downfall of the Achaemenid dynasty.[2]
Persepolis is near the small river Pulwar, which flows into the river Kur (Kyrus). The site includes a 125,000 square meter terrace, partly artificially constructed and partly cut out of a mountain, with its east side leaning on Kuh-e Rahmet ("the Mountain of Mercy"). The other three sides are formed by retaining walls, which vary in height with the slope of the ground. From 5 to 13 meters on the west side a double stair, gently slopes to the top. To create the level terrace, depressions were filled with soil and heavy rocks, which were joinedtogether with metal clips.

Around 518 BC, construction of a broad stairway was begun. The stairway was planned to be the main entrance to the terrace 20 meters above the ground. The dual stairway, known as the Persepolitan stairway, was built in symmetrically on the western side of the Great Wall.The 111 steps were 6.9 meters wide with treads of 31 centimetres and rises of 10 centimetres. Originally, the steps were believed to have been constructed to allow for nobles and royalty to ascend by horseback. New theories 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 Nations.

Grey limestone was the main building material used in Persepolis. After natural rock had been levelled and the depressions filled in, the terrace wasprepared. 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 foundation of the terrace acted like a castle whose angled walls enabled its defenders to target any section of the external front. Diodorus writes that Persepolis had three walls with ramparts, which all had towers to provide protection space for the defense personnel. The first wall was 7 meters tall,the second, 14 meters and the third wall, which covered all four sides, was 27 meters in height, though no presence of the wall exists in modern times.