Book excerpt: Of all prehistoric monuments, few are more emotive than the great stone circles that were built throughout Britain and Ireland. From the tall, elegant, pointed monoliths of the Stones of Stenness to the grandeur of Stonehenge and the sarsen blocks at Avebury, circles of stone exert a magnetic fascination to those who venture into their sphere. In Britain today, more people visit these structures than any other form of prehistoric monument and visitors stand in awe at their scale and question how and why they were erected. Building the Great Stone Circles of the North looks at the enigmatic stone structures of Scotland and investigates the background of their construction and their cultural significance.