Cultybraggan lies close to the village of Comrie, in west Perthshire. It was first used as a prisoner of war (PoW) camp during World War II, and then became an Army training area. It later housed a Royal Observer Corps (ROC) nuclear monitoring post, and a Regional Government Headquarters (RGHQ).The camp ceased to be used by the military in 2004, and now belongs to the Comrie Development Trust, bought through a community right-to-buy option for £350,000 in 2007.Some of the original 100 Nissen huts on the western side of the camp were demolished in the 1970s to make way for a firing range, but the majority remain. The surviving huts, together with an assault course and modern Officers' Mess facility, make Cultybraggan "one of the three best preserved purpose-built WWII prisoner of war camps in Britain". In 2006, a number of structures at the camp were listed by Historic Scotland. Huts 19, 20, and 44–46 are category A listed as being of national significance, while huts 1-3, 21, 29-39, and 47-57 are category B listed.In 2016, a project to renovate the camp and turn it into a 4-star hotel was announced.World War IINamed PoW camp No 21, built in 1941 to house 4,000 Category A prisoners, Cultybraggan was a 'black camp', holding those considered the most committed and fanatical Nazi PoWs, mainly young Waffen-SS, Fallschirmjäger and U-boat crew. Army, Navy, Air Force and SS prisoners were held in separate compounds, as were the officers. An additional camp was located at Cowden, two miles distant.