The Giant's Castle cliff castle, St Mary's

The National Heritage List for England records The Giant's Castle cliff castle, 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.

The Giant's Castle cliff castle on St Mary's is believed to have been built during the early medieval period, likely by a local chieftain or Norse settler group. It is important as a rare example of a cliff-top defensive site in the Isles of Scilly, reflecting early settlement patterns and maritime defense strategies in the region.