Lligwy Burial Chamber
A tomb is a repository for the remains of the dead. It is generally any structurally enclosed interment space or burial chamber, of varying sizes.
A tumulus or tumuli is a mound of earth and stones raised over a grave or graves. Tumuli are also known as barrows and burial mounds. These can be found throughout much of the world. A tumulus composed largely or entirely of stones is usually referred to as a cairn. During the 19th century in England the excavation of tumuli was a popular pastime amongst the educated and wealthy middle classes, who became known as "barrow-diggers". This leisure activity played a key role in laying the foundations for the scientific study of the past in Britain but also resulted in untold damage to the sites.
Barrows were popularly used to bury the dead from the late Neolithic until the end of the Bronze Age, 2900-800BC. Square barrows were occasionally used in the Iron Age, 800BC-43AD in the east of England. The traditional round barrow experienced a brief resurgence after the Anglo-Saxon invasion, as Scandinavian burial practice became popular 500-600AD. These later barrows were often built near older Bronze Age barrows.
A dolmen, also known as a portal tomb, portal grave, or quoit, is a type of single-chamber megalithic tomb, usually consisting of three or more upright stones supporting a large flat horizontal capstone. Most date from the early Neolithic period. Dolmens were usually covered with earth or smaller stones to form a barrow, though in many cases that covering has weathered away, leaving only the stone structure of the burial mound intact.