A gallery grave is a form of megalithic tomb built primarily during the Neolithic Age[1] in Europe in which the main gallery of the tomb is entered without first passing through an antechamber or hallway.[1][2][3] There are at least four major types of gallery grave (complex, transepted, segmented, and wedge-shaped), and they may be covered with an earthen mound (or "tumulus") or rock mound (or "cairn").