WThe Bréhon Tower is accessible only by boat and sits on Bréhon rock, an island in the Little Russell channel about 1.5 km northeast of St Peter Port, Guernsey, between the port and the islands of Herm and Jethou. Thomas Charles de Putron (1806–1869) built the oval tower of granite from Herm, completing the work in 1857.
WThe Chateau des Marais is a protected chateau in Saint Sampson, Guernsey. The colloquial name is Ivy Castle. A moated medieval castle dating from before the 12th-century.
WThe island of Guernsey has been fortified for several thousand years, the number of defence locations and complexity of the defence increasing with time, manpower and the improvements in weapons and tactics.
WFort George is situated in Saint Peter Port, Guernsey, and was built to become the main island military headquarters and to protect barracks to house the island garrison for the British Army, in place of Castle Cornet.
WFort Grey, colloquially known as the "cup and saucer", is a Martello tower located on a tidal rock in Rocquaine Bay in Saint Peter, Guernsey on the west coast of the island.
WAfter the Wehrmacht occupied the Channel Islands on 30 June 1940, they assessed the existing defences to determine if they would be of use. The Germans found the Islands' fortifications antiquated and woefully inadequate for modern warfare.
WFort Hommet is a fortification on Vazon Bay headland in Castel, Guernsey. It is built on the site of fortifications that date back to 1680, and consists of a Martello tower from 1804, later additions during the Victorian Era, and bunkers and casemates that the Germans constructed during World War II.
WThe Fort Hommet 10.5 cm coastal defence gun casemate bunker is a fully restored gun casemate that was part of Fortress Guernsey constructed by the forces of Nazi Germany between 1940 and 1945.
WThe British built 15 Guernsey loophole towers at various points along the coast of Guernsey between August 1778 and March 1779 to deter possible French attacks after France had declared itself an ally of the American rebels in the American Revolutionary War. Towards the start of the Napoleonic Wars several towers received additional reinforcement in the form of batteries at their bases. Today, 12 towers still survive, three having been destroyed at different times. Two of the survivors, Petit Bôt and Rousse, contain interpretive exhibits that the public may examine.
WFort Saumarez is a Martello tower in Saint Peter, Guernsey, on a headland that forms the northern tip of L'Erée and extends to the Lihou causeway.
WVale Castle, is a protected building located in the Vale, Guernsey. The original name was "Le Chateau St Michel", later it became "Chateau de Val" or "Chateau de Valle" and is over 1,000 years old. It defends both St Sampson’s harbor at the eastern end of the Braye du Valle, Guernsey, and Bordeaux Harbour.