This volume describes the results of the Longstones Project, a joint-universities programme of excavation and survey designed to develop a fuller understanding of the context and dynamics of monument construction in the later Neolithic (3rd millennium BC) of the Avebury region, Wiltshire. Several elements of this internationally important prehistoric monument complex were investigated: an early-mid 3rd millennium BC enclosure at Beckhampton; the recently re-discovered Beckhampton Avenue and Longstones Cove; a section of the West Kennet Avenue; the Falkner's stone circle; and the Cove within Avebury's Northern Inner Circle. The research sheds new light on the complexities and development of this monument rich area and consideration is given to the questions of how and why ceremonial centres such as that at Avebury came into being in the 3rd millennium BC. The importance of understanding the agency - the affective and perceived inherent qualities - of materials and landscapes is stressed; and the unusual character of the Wessex monument complexes is highlighted by comparison with the format and sequences of other ceremonial centres in southern Britain. The second part of the monograph tracks the later, post-prehistoric, lives of Avebury's megalithic monuments including a detailed account of the early 18th-century records of the Beckhampton Avenue made by the antiquary William Stukeley.