The ruins of a small artillery fort built in during the reign of Edward VI (1547-53). In 1651 it was garrisoned by Royalists during the Civil War.
Read more about the history of King Charles' Castle.
Before You Go
Access: Perched on the hillside just north of New Grimsby harbour, the castle is only accessible on foot. The steep footpath winds across a heather studded hillside so sturdy footwear is advisable.
Dogs: Dogs on leads are welcome.
Please be aware: Do not climb on the walls.
English Heritage does not permit drone flying from or over sites in our care, except by contractors or partners undertaking flights for a specific purpose, who satisfy stringent CAA criteria, have the correct insurances and permissions, and are operating under controlled conditions.
Plan a Great Day Out
Refreshments are available from a well-stocked shop just south of New Grimsby harbour.
Walk down to Cromwell's Castle, standing on the promontory below. Both castles, along with the Old Blockhouse on the east side of Tresco, can be included on a six mile circular coastal walk around the island.
Call in at the Isles of Scilly museum in Hugh Town on St Mary's where you can discover more about history of the Isles.