thicker, concrete ceiling. It may originally have been vaulted in stone in a similar style to nearby Hurst Castle. The first floor of the keep has been restored to its early 20th-century appearance as a barracks room. The second floor was redeveloped in the late 19th century to form another barracks room, with its ceiling incorporating additional early 20th-century girders and concrete to support the gun battery above it. The roof of the keep has two 12-pounder gun mounts with their original gun-lockers; there is a 12-pounder gun on display originally used on a Royal Naval vessel. The keep's roof would originally have been flat, with crenellations for artillery, but both the roof and crenellations were removed in the 1770s. See also Governor of Calshot Castle Castles in Great Britain and Ireland Notes References Bibliography External links English Heritage's visitor page Buildings and structures completed in 1540 16th-century forts in England English Heritage sites in Hampshire Castles in Hampshire Forts in Hampshire Device Forts Tourist attractions in Hampshire Grade II* listed buildings in Hampshire 1540 establishments in England