A passage tomb is a type of ancient burial structure characterized by a long passage leading to a central chamber. These tombs are typically made of large stones and are often covered by earth or a mound. They were primarily constructed during the Neolithic period and are found in various parts of Europe, particularly in regions like Ireland and Scotland. The design of passage tombs allows for the placement of multiple burials and often includes intricate carvings or artwork. Notable examples include Newgrange in Ireland and Maeshowe in Orkney. These sites are significant for understanding prehistoric cultures and their burial practices.