Dannevirke

Dannevirke is the largest defensive structure and ancient monument in the Nordic countries. It consists of ramparts and walls and was created and expanded between the years 600 and 1200. The fortress was intended to secure the southern border of the kingdom and stretched across Jutland between the Slien fjord and the River Trenen. The Dannevirke served as a defensive fortification at the latest during the 1864 war (the Second Schleswig War), and the fortifications have an almost mythical role in Danish history.