Long barrows were ancient communal tombs built as elongated mounds of earth or chalk covering a wooden or stone chamber. Burials took place over 3-4 generations or a decade. Over 300 have been found concentrated in Wessex and the Cotswolds. They were often built on prominent hills away from settlements and may have served as territorial markers and burial chambers. Initial excavations show long barrows were built resembling Neolithic longhouses, with human remains added to and removed from the structures over centuries as part of ancestral rites and fertility ceremonies.