Top 6 Castles on the Isles of Scilly

The Isles of Scilly are rich in historical fortifications. Key sites include Star Castle on St Mary's, built in 1593 during the Spanish invasion scare, and Cromwell's Castle on Tresco, a Parliamentarian gun tower from the English Civil War. You can also explore King Charles's Castle, an earlier artillery fort on Tresco.

Many of the castles provide stunning coastal and island views due to their strategic locations. Star Castle offers commanding views over the water from its position within the Garrison. From Cromwell's Castle, you can enjoy excellent views from its upper platform over New Grimsby Sound. Similarly, King Charles's Castle provides a great vantage point over New Grimsby Sound.

Yes, the Garrison Walls on St Mary's are extensive defensive walls that began construction in the 1590s and were further developed during the English Civil Wars. They are cared for by English Heritage, and visitors can walk most of their length, enjoying both the historical atmosphere and panoramic vistas. The walls surround the headland beside Hugh Town and are next to Star Castle.

Yes, Cromwell's Castle on Tresco is freely accessible. You can explore its tall, circular gun tower and adjacent gun platform, and it features a beautiful vaulted room inside. The upper platform offers excellent views over New Grimsby Sound.

Many of the sites are suitable for families, offering open spaces and historical exploration. Harry's Walls on St Mary's, the ruins of an unfinished Tudor fort, is listed as family-friendly and is free to visit. Exploring the Garrison Walls around Star Castle is also a great activity for all ages.

The Isles of Scilly offer various outdoor activities near its historical sites. You can find numerous hiking trails, such as the 'Garrison Walls Trail' on St Mary's, which is an easy 3.6 km loop. There are also cycling routes like the 'Tresco loop' and running trails. For more details on routes, you can explore the Hiking on the Isles of Scilly, Cycling on the Isles of Scilly, and Running Trails on the Isles of Scilly guides.

The Isles of Scilly are beautiful year-round, but the spring and summer months (April to September) generally offer the most pleasant weather for exploring the outdoor castle sites and walking trails. During these times, you'll experience milder temperatures and longer daylight hours, ideal for island-hopping and enjoying the coastal views.

Yes, Harry's Walls on St Mary's is a notable example of an unfinished Tudor fortification. Started in 1551, it was planned as a square fort but was never completed. These ruins are free to visit and offer an intriguing glimpse into historical military planning.

Visitors frequently highlight the combination of historical significance with stunning natural beauty. They appreciate the opportunity to walk around sites like the Garrison Walls, taking in the historic sights and panoramic views. The unique architecture, such as the distinctive eight-pointed star shape of Star Castle, and the sense of being amidst centuries of defense are also highly valued.

Given the coastal and often exposed nature of these sites, it's advisable to wear comfortable walking shoes suitable for uneven terrain. Layered clothing is recommended, as the weather can change quickly. A waterproof jacket is also a good idea, especially outside of peak summer, to protect against sea breezes and potential rain.

While most fortifications date from the Tudor era and English Civil War, the Isles of Scilly also feature much older historical sites. For instance, Innisidgen Burial Chamber is a prehistoric ritual site from the Iron or Bronze Age, offering a fascinating piece of ancient history alongside the later castles.

The Old Blockhouse on Tresco is an early Tudor defensive structure, likely built in the late 1540s. It was constructed to protect the harbor of Old Grimsby and features a raised gun floor facing east over the harbor, showcasing early defensive architecture.