Fort Monckton

Fort Monckton stands on the south-east shoreline of the Gosport peninsula in Hampshire, overlooking Portsmouth Harbour. It was built in the 1780s on the site of an earlier Henrican fort called Haselworth Castle, which had been abandoned by the mid-16th century. The fort was later rebuilt in the 1880s as part of a broader programme of coastal defences. Today it houses a training centre for the intelligence services. The fort is worth visiting for its layered history and strategic importance. It was named after Lieutenant-General Sir Robert Monckton, who ordered its initial construction during the American War of Independence. The Duke of Richmond criticised its early design, and the fort was rebuilt several times before completion. In the 19th century it hosted experiments with electric and search lights, and during the world wars it served as an anti-aircraft post. Visitors find a well-preserved 18th-century fort with later additions. The original bastions, sea-facing casemates and guard room remain, along with a surviving caponier and ditch. A modern drawbridge leads into the site, now ringed by security fencing and lighting. Inside, the Ministry of Defence runs training for intelligence officers and allied services, blending historic stonework with contemporary facilities.