Barrows are ancient burial mounds found in various parts of the world, particularly in Europe. They were constructed during the Neolithic and Bronze Ages and often contain human remains, grave goods, and artifacts. These mounds can vary in size and shape, ranging from simple earthworks to elaborate structures. Typically, barrows are associated with prehistoric cultures and serve as important archaeological sites. They provide insights into ancient burial practices, social structures, and the beliefs of the people who built them. Some well-known examples include the Silbury Hill in England and the Newgrange passage tomb in Ireland.