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Harry's Walls is an unfinished 16th century artillery fortification located on Mount Flagon, St Mary's in the Isles of Scilly, Cornwall. The castle was constructed during the reign of Henry VIII as part of the Tudor defensive programme against foreign invasion, though construction was abandoned before completion, leaving the distinctive angular bastioned design characteristic of early modern military architecture partially realized. The site retains substantial earthwork and structural remains of its gun platforms and defensive works. Adjacent to the fortification stands a prehistoric standing stone, indicating the long continuity of settlement and significant land use on this prominent headland across multiple historical periods.
Harry's Walls unfinished 16th century artillery castle and adjacent prehistoric standing stone at Mount Flagon, St Mary's is a scheduled monument protected by Historic England under reference 1013274. View the official record →
Harry's Walls is an unfinished 16th century artillery fortification located on Mount Flagon, St Mary's in the Isles of Scilly, Cornwall. It is designated a Scheduled Ancient Monument by Historic England (NHLE) under reference 1013274.
Harry's Walls unfinished 16th century artillery castle and adjacent prehistoric standing stone at Mount Flagon, St Mary's 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 1013274.
Several scheduled monuments lie within 10 km, including Kerbed platform cairn on Wingletang Down, 80m north east of Porth Askin (4.4 km), Nineteenth century gig-shed north east of Porth Askin (4.4 km), Two 19th century gig-sheds ENE of Porth Askin (4.4 km).
Aubrey generates in-depth historical research for any address in Britain — drawing on scheduled monument data, Domesday records, Roman heritage, PAS finds and medieval history to reveal the complete story of a landscape.
Research the area around Harry's Walls unfinished 16th century artillery castle and adjacent prehistoric standing stone at Mount Flagon, St Mary's