Persepolis
Darius I built the greatest palace at Persepolis on the western side of platform. This palace was called the "Apadana". The King of Kings used it for official audiences. The work began in 518 BC, and his son, Xerxes I, completed it 30 years later. The palace had a grand hall in the shape of a square, each side long with seventy-two columns, thirteen of which still stand on the enormous platform. Each column is high with a square Taurus (bull) and plinth. The columns carried the weight of the vast and heavy ceiling. The tops of the columns were made from animal sculptures such as two-headed lions, eagles, human beings and cows (cows were symbols of fertility and abundance in ancient Iran). The columns were joined to each other with the help of oak and cedar beams, which were brought from Lebanon. The walls were covered with a layer of mud and stucco to a depth of 5 cm, which was used for bonding, and then covered with the greenish stucco which is found throughout the palaces.
Nicopolis
In 28 BC, 3 years after his victory in the naval battle of Actium, Octavian founded a new city which he called Nicopolis (the City of Victory), located on the southernmost promontory of Epirus, and across the mouth of the harbour from the ancient town of Actium. This foundation echoed a tradition dating back to Alexander the Great, and more recently illustrated by Pompey, founder of Nicopolis in Little Armenia (63 BC). Symbolically, the new city represented one example of his successful unification of the Roman Empire under one administration. Geographically, it constituted a major transportation and communications link between the eastern and western halves of the Mediterranean. Economically, it served to reorganise and revitalise the region, which had never recovered from its destruction by Lucius Aemilius Paullus Macedonicus in the Third Macedonian War (171–167 BC), or the further destruction under Sulla in 87–86 BC. It also established an important commercial centre and port at this strategic position on the Mediterranean sea routes.