Castles in Cornwall
Cromwell's Castle / Isles of Scilly
17th-century round tower positioned on a rocky promontory guarding the anchorage between Bryher and Tresco.
Harrys Walls / Isles of Scilly
16th-century fort built over St Mary's Pool harbour, but never finished
King Charles Castle / Isles of Scilly
Remains of castle built for coastal defence on the north side of Tresco