Karlsborg
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Karlsborg is a city in northern Västergötland, at lake Vättern.Understand
Karlsborg was purpose-built during the 19th century as a secondary capital city of Sweden, if a foreign invasion would force the national government to evacuate from Stockholm. Though this strategy is obsolete today, the military presence remains high.
See
Karlsborg Fortresshas room for the Royal family and the central government institutions.