This IHA provides an introduction to megalithic chamber tombs, often dating to early in the Neolithic period around 3500 BC, they are referred to here for simplicity as 'tombs' whatever their true function. Descriptions of megalithic chamber tombs and a brief chronology from 3755 BC to 1500 BC are included. Radiocarbon dating along with the presence of artefacts indicates that they were in use at the same time as causewayed enclosures and similar monuments and it has been suggested that there may have been a functional connection between the two types of monument. A list of in-depth sources on the topic is suggested for further reading. Despite considerable restoration, Spinster's Rock is a commanding and thought-provoking landmark. The restoration work itself is now historic and served to maintain this enigmatic monument for future generations to ponder and marvel at. Faced with the enormous nature of the stones used in its construction and knowing the limited available contemporary technology of such an ancient past, Spinster's Rock bears witness to the significant social and political organisation enabling its conception, inception and creation.