An aspect of Christiansfeld is that it must be one of the most northern cities in Germany for about 55 years. After the war Germany-Denmark 1864, the border was placed some kilometers north of Christiansfeld. (The German land survey marker still stands in a dike along the old highway.) Then, after 1 world war, the referendum about new border Denmark-Germany took C. back to Denmark. This border from 1920 still is in place and we can study the further aspects in the new WHS Hedeby and Danevirke in Germany.