The Grebenhain Muna Museum depicts the history of the so-called Hartmannshain air munitions facility (1936 to 1945) during the National Socialist period in the Oberwald near Grebenhain. The ammunition factory ("Muna") was one of about 370 such facilities of the armed forces of the Wehrmacht for the production of ammunition suitable for use in wartime operations from the sharp and unsharp components supplied by the armaments industry. At times up to 800 people worked in the "Muna" near Grebenhain during the Second World War, mainly "conscripts" from the region and from 1943 about 130 Ukrainian forced laborers. In its permanent exhibition, the Muna Museum addresses the origins and infrastructure of the "Muna", its role in armaments and warfare, "everyday work" in the "Muna" and the "labor assignment" of forced laborers there, as well as the end of the Plant 1945. A separate part of the exhibition is also dedicated to the diverse uses of the Muna site after the Second World War: civilian residential and industrial area Oberwald, de-munitions, NATO supply camp, Berlin holiday camp. A large wall map, unique in this form, showing the locations of all Wehrmacht ammunition plants is also part of the permanent exhibition, as are many historical exhibits and several films as well as a collection of 120 photographs, mainly from the service life of the Muna and Allied aerial reconnaissance photographs. In 2013, the branch of the Muna Museum was inaugurated in a bunker in the former NATO supply camp, which contains more original and v. a. also contains larger exhibits, such as the empty shell of a so-called anti-tank bomb with an empty weight of more than one ton. The peace movement in East Hesse in the 1970s and 1980s is also shown here.