The First exhibition hall, completed in 1914 for automobile exhibitions, was located north of today's exhibition center in the parking area between the central bus station and the S-Bahn ring. Because of the First World War, however, it was not opened until the German Motor Show on September 23, 1921. https://frankfurtfuartakvimi40448.wikigiogio.com/1094705/makina_fuarlari_no_further_mystery