From June 1941 to May 1945, nearly 20,000 prisoners were held at Grini. Most of the prisoners were Norwegian, but there were also some from other countries.
Today, the Grini Museum is part of the Museums in Akershus - MiA. The Grinimuseet will convey the significance of the prison camp in Norwegian war and social history, and how the political and human conditions in the camp are relevant even today.
In recent years, extensive work has been done to further develop the Grini Museum and develop new permanent exhibitions about the largest German prison camp in Norway during World War II. The exhibitions deal with topics such as arrest, methods of punishment, prison guards, isolation and illegal communication.