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