Stonehenge has always been a place of wonder and speculation, but it is only in this century that it has been submitted to the rigorous scrutiny of scientific archaeology. In this volume, archaeologists, environmentalists, engineers, astronomers, and geologists draw on this data, pulled together for the first time, to advance our understanding of one of the greatest prehistoric monuments in Europe. This definitive account of the continuing debate also points the way forward to new programmes of scientific research for Stonehenge and its environment.