The Achaemenians, who were a notable and distinguished tribal division of the Persian people, after founding a wide empire extending from the Sind Valley to beyond the Nile, and from the Oxus to the banks of the Danube, determined to build in their birthplace, Persia, a splendid and magnificent palace, befitting the wide-spread empire and surpassing all the capitals of the countries of the ancient East. Accordingly on a site beside the Mountain of Mercy (Kuh_i_Rahmat), overlooking the wide green plain of Marvdasht, which for thousands of years prior to the Achaemenians had been the cradle of a conspicuous culture and art. The plan of a great palace was drawn up, and the first stone of the largest hall there was laid by the powerful hand of Darius the Great between the years 514 and 512 BC.
The book is very precise in it's Archaeological evidences, as the author was heavily involved with the Persepolis Archaeological expeditions, but the historical evidences are heavily biased to make the Persian empire look better than it was and ignore some acts that would make it look less civilised and at some points would contradict his points. The book does however quote very many good extra sources; even though the citations are not academically correct.
Any book that teaches me something I didn't know before is a good book. The style of writing, with graphics, was an interesting one. And definitely made reading it a bit easier than had it been only words.