Porth Hellick Down

Porth Hellick Down is a Neolithic and Bronze Age burial site on St Mary's, Isles of Scilly, featuring at least six entrance graves -- the largest surviving assembly of this rare tomb type in Britain [1]. The best-preserved chamber, known as "The Great Tomb," dates to c. 1500 BC and features a near-circular mound 39 feet in diameter with a stone-lined burial chamber roofed by four massive capstones [2]. Excavated by George Bonsor in 1899, the site also includes unchambered cairns and a prehistoric field system with a linear boundary of small upright stones [1][2].