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Schleswig Cathedral officially the Cathedral of St. Peter at Schleswig, is the main church of the city of Schleswig and was the cathedral of the Bishop of Schleswig until the diocese was dissolved in 1624. It is now a church of the North Elbian Evangelical Lutheran Church, the seat of the Lutheran Bishop of Schleswig and Holstein, and ranks among the most important architectural monuments of Schleswig-Holstein.
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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.
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.