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Cromwell's Castle is a mid-17th century blockhouse constructed on the western coast of Castle Down, Tresco, Isles of Scilly, Cornwall. Built during the English Civil War period under the Commonwealth, the structure reflects the strategic military importance of the Scilly Islands as a contested stronghold. The original blockhouse was subsequently modified in the 18th century with the addition of a gun platform, adapting the fortification to changing military requirements and artillery practices of that era. The site remains an important example of Civil War military architecture in the southwest of England.
Cromwell's Castle mid-17th century blockhouse and 18th century gun platform on the western coast of Castle Down, Tresco is a scheduled monument protected by Historic England under reference 1013275. View the official record →
Cromwell's Castle is a mid-17th century blockhouse constructed on the western coast of Castle Down, Tresco, Isles of Scilly, Cornwall. It is designated a Scheduled Ancient Monument by Historic England (NHLE) under reference 1013275.
Cromwell's Castle mid-17th century blockhouse and 18th century gun platform on the western coast of Castle Down, Tresco is a Scheduled Ancient Monument, legally protected by Historic England (NHLE) — the body responsible for designating and safeguarding heritage sites in England. The official designation reference is 1013275.
Several scheduled monuments lie within 10 km, including Kerbed platform cairn on Wingletang Down, 80m north east of Porth Askin (8.5 km), Nineteenth century gig-shed north east of Porth Askin (8.5 km), Two 19th century gig-sheds ENE of Porth Askin (8.6 km).
This page is just one thread. A full Aubrey report pulls together 15 strands of Cromwell's Castle mid-17th century blockhouse and 18th century gun platform on the western coast of Castle Down, Tresco's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Cromwell's Castle mid-17th century blockhouse and 18th century gun platform on the western coast of Castle Down, Tresco stands on Ordovician granite, bedrock that formed in the Ordovician. The rock here is granite group.