The fortresses have a severely geometrical street system, the inner area being divided into squares, each with four longhouses arranged in a quadrangle.The architecture of all four fortresses is uniform and strictly symmetrical, as clearly illustrated by the circular shape of the fortifications and the location of the gates at the four points of the compass - apparently without regard to the terrain.
New institutions were developed, smaller regions were merged into larger units and the Scandinavians took part in European development on a larger scale.
Scandinavia at the time of King Knut, in the early 11th century, was vastly different from the Scandinavia that was visited by the missionary Ansgar in the early 9th century.
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Individual elements of the property and their mutual relationship, including to the landscape: The fortresses are all located in landscapes typical of their respective regions, in river valleys and relatively close to the coast.