Erected by the ancient Greeks as a temple to Athena, the Parthenon has served as a church, a fortress, an ammunition dump, and the model for countless banks, courthouses, and museums across the world.Surprisingly, despite much abuse and renown as an icon of Western civilization, the question of how the Parthenon was built has been largely ignored until recently. Thanks to the Greek government's $10 billion restoration program, scholars are finally probing the enigmas of its planning and construction. With unprecedented access, NOVA presents the inside story of the official restoration, which reaches far beyond the challenges and controversies of conserving one of the world’s best-known buildings. The researchers are confronting some truly monumental riddles: How did the ancient Athenians build their great temple with incredible precision in a mere eight years? How did they manage to incorporate subtle, eye-pleasing distortions into the Parthenon s layout, such that there are few straight lines or right angles to be seen? And, most baffling of all, how did they accomplish all of this without an overall building plan or blueprint, which would be indispensable to a modern architect?