London's British Museum recently exhibited Forgotten Empire: The World of Ancient Persia to much critical acclaim. Some 460 impressive works of ancient Iranian art were culled from four international collections: the National Museum in Tehran, Iran's Persepolis Museum, Paris' Musée du Louvre and the British Museum. The exhibition's easily attainable catalogue vividly describes the artistic accomplishments of the Persian Empire's Achaemenid rulers during more than two centuries of the dynasty's reign (550-330 B.C.).