The small website mark in the corner is on the preview only — it isn't printed on the poster you receive.
Scilly - Tresco - Cromwells 2
Scilly - Tresco - Cromwells
Cromwell's Castle — the 17th-century round tower built after the Civil War to guard New Grimsby Sound between Tresco and Bryher, replacing an older fort up the hill. Reachable on foot from New Grimsby along the shore path.