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Photo: Casiopeia, CC BY-SA 3.0 via Wikimedia Commons
Literally meaning the Earthworks of the Danes, the first of these walls were constructed already around 500 AD as a protective wall against the south. A few centuries later, it was expanded by the Vikings into a system of trenches and walls. Interestingly, the Danevirke was used in the war against Prussia in 1864 when the Danes lost the area.
The Danevirke or Danework is a system of Danish fortifications in Schleswig-Holstein, Germany. This historically important linear defensive earthwork across the neck of the Cimbrian peninsula was initiated by the Danes in the Nordic Iron Age about AD 650. It was later expanded multiple times during Denmark's Viking Age and High Middle Ages. The Danevirke was last used for military purposes in 1864 during the Second War of Schleswig.
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Houses two museums these days.
Haithabu
The remains of an ancient Viking settlement, which is now considered the most important archaeological site of Schleswig-Holstein. There is a museum and reconstructed houses where you can learn about the history of Hedeby and the everyday life of the Vikings.
St. Peter