This book began with one site in Ireland and closes with another. The Loughcrew Hills in County Meath include at least twenty-five megalithic tombs, located on three summits along a prominent ridge. Many of them were investigated in the nineteenth century when Neolithic artefacts were found there. More recent work has been less extensive but features an analysis of the carved decoration inside these monuments, for the Loughcrew complex is one of the main concentrations of megalithic art in Europe (Shee Twohig 1981: 205–20). Early excavation in the westernmost group of monuments had an unexpected result, for Cairn H contained a remarkable collection of artefacts which must have been deposited three thousand years after the tomb was built. They included bronze and iron rings, glass beads, and over four thousand bone flakes (Conwell 1873). A new excavation took place in 1943, but its results only added to the confusion and, perhaps for that reason, they were not published for more than six decades (Raftery 2009). They seemed to show that the artefacts, which obviously date from the Iron Age, were directly associated with the construction of the monument; today it seems more likely that they were a secondary deposit. When they were introduced to the site, the tomb may have been rebuilt. One reason why the bone flakes attracted so much attention is that a small number of them—about a hundred and fifty in all— were decorated in the same style as Iron Age metalwork. Most of the patterns are curvilinear and show the special emphasis on circles and arcs that characterize ‘Celtic’ art (Raftery 1984: 251–63). This discovery illustrates a problem in Irish archaeology. A few stone tombs in other regions were decorated in a style that has been identified as either Neolithic or Iron Age (Shee Twohig 1981: 235–6), but in the case of the flakes from Loughcrew there is no such ambiguity. Not only do the incised patterns compare closely with those on metalwork, the decorated artefacts were associated with beads and rings dating to the end of the first millennium BC. Even so, two problems remain.