SV 881-159 Isles of Scilly England
Cromwell's Castle is a stone 17th century circular artillery tower, with a low 18th century gun platform, that has its own access and guard room. Built on a promontory, to guard the anchorage between Bryher and Tresco, the large three storey tower, supports a platform, pierced by six gun-ports. Visit pending. 4 miles south-east is Star Castle.
Cromwell's Castle is located on the north-west shoreline of Tresco, a mile north-west of New Grimsby. 4 miles north-west of Hugh Town on St Mary's island, by ferry and then on foot.
The site is owned by English Heritage and is freely accessible in daylight hours.