The palace complex of the Persian King Darius I, the Great (522-486 BCE), provides unique evidence of the sophistication of Achaemenid architecture and construction. This palace, built 2500 years ago in western Iran, lay at the centre of the Persian Empire that stretched from the Nile and the Aegean to the Indus Valley. First rediscovered in 1851, the palace of Darius was partly excavated over the next century. But it was only field research between...