A Glasshouse, or The Glasshouse was the term for a military prison in the British Army. The first military prisons were established in 1844. The term Glasshouse originated at the military prison at Aldershot, which had a glazed roof. Over time, the sobriquet came to be applied to all British Army prisons. This prison, called the Detention Barracks, had begun as several barracks in 1856, before being replaced by a single, large building, modelled on civilian prisons, in 1870. This building was destroyed by fire in a riot of 1946.