Killing House
The British Special Air Service's prime training facility for hostage rescue operations is the Killing House. The point of the Killing House is to train the SAS operatives to enter a room and be able to assess the situation and shoot any threats. The Counter-Terrorism team of SAS uses it for Close Quarter Battle training (CQB). The Killing House is located at the Stirling Lines barracks, near Hereford. It is a two storey building with four rooms on each level. It is designed just like a conventional building, with furniture, pictures, toilets, etc. The building has  special rubber-coated walls to absorb bullets, extractor fans to clear out fumes, and video cameras in corners to record the action in the rooms. Each room has at least one metal target. The facility has been visited by dignitaries including Prince Charles, Diana, Princess of Wales, and Prime Minister Margaret Thatcher. The idea of the Killing House has been adopted by other elite units, including America's Delta Force, the FBI, Israeli special forces, FSK (of Norway).