Note: Aggersborg in the county commune of Nordjylland in Denmark is the site of an ancient circular fortification built around 980 CE by the Danish king Harold Bluetooth. It is the largest Viking fortress in Scandinavia, whose remains are known today, having consisted of 48 longhouses, accommodating approximately 5000 men, a surrounding rampart, and a dry moat. After Harold, it passed into the hands of successive kings until 1579, when it passed into private ownership. In the 20th century the formerly fortified area was taken over by the state and registered as a national monument. The ramparts have been restored in a slightly altered state. The other notable feature of the town is its old church.
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