Constructed in several phases over a period of some 1500 years, beginning in 3000 BC, Stonehenge's key elements are its ``bluestones,`` transported from West Wales by unexplained means, and its sarsen stones quarried from the nearby Marlborough Downs Francis Pryor delivers a rigorous account of the nature and history of Stonehenge, but also places the enigmatic monument in a wider cultural context, bringing acute insight into how antiquarians, scholars, writers, artists-and even neopagans--have interpreted the mystery over the centuries.