Two entrance graves and a platform cairn 90m ESE of Basin Rock, Porth Hellick Down, St Mary's

The National Heritage List for England records Two entrance graves and a platform cairn 90m ESE of Basin Rock, Porth Hellick Down, St Mary's as a scheduled monument. The saved point comes from the centre supplied by the official record. Listing does not by itself mean that the public may enter the place.

Two entrance graves and a platform cairn, dating to the Neolithic or early Bronze Age, are part of a broader funerary and ritual landscape on St Mary's. Their survival contributes to understanding prehistoric burial practices and monument placement in the Scilly Isles.