2-645-384 - © CM Dixon/Heritage Images

Tregiffian Barrow, Neolithic tomb, 3rd Millennium BC, Penwith, Cornwall, 20th century. Neolithic or early Bronze Age barrow or echambered tomb, is a rare form of passage grave, known as an Entrance grave. It has an entrance passage, lined with stone slabs, which leads into a central chamber. First excavations were carried out on the grave in 1871 by William Copeland Borlase.