Persepolis (Greek for Persian City) was the ornamental capital city that Cyrus the Great founded late in his life around 515 BCE. He wouldn’t live to see much of it built, but his predecessor Darius would and indeed built much of the city including terraces and the great palaces.
The work was finished by his son King Xerxes the Great who completed the Apadana Palace, the Imperial Treasury and the Council Hall. Building on the terraces around the city continued until the fall of the empire. Even after the Persians fell, the city remained an important feature until it declined and was replaced as a capital by Stakhr, a few kilometers away.
Persepolis was a grand undertaking by a line of kings who each commissioned different parts of the city and took part in finishing them. For example, Cyrus the Great started the city, Darius commissioned the beautiful Apadana palace and his son finished it.
In its heyday, Persepolis was the ceremonial heart of the large Persian empire, with many beautiful statues and buildings and the summoning of leaders from all four corners of the empire to take part in ceremonies honoring the Great King. The city was built as a merging of all different architecture from all four corners of the Empire: Egyptian, Assyria, Iranian, and Babylon; it was made from a variety of materials and artists came from all different cities to work on it.
There are processions of people and animal statues and carvings all over the ruined buildings, detailing all the different nationalities of people who would come to the cities, from the Egyptians to Arabs to Indians; all of whom made up the patchwork of the great Persian Empire. Persepolis was one of the greatest examples of the merging of cultures shown in its architecture.