Aggersborg Viking fortification
Aggersborg is the largest Viking fortification found in Denmark.
Aggersborg is one of several Viking fortresses built in the reign of King Harald Bluetooth. The other fortresses are found at Fyrkat at Hobro, Nonnebakken at Odense, (now destroyed), Trelleborg at Slagelse and Trelleborg near Skåne (formerly a part of Denmark, but now a part of Sweden). All of the fortresses follow the same geometric pattern.
Aggersborg has a diameter of 240 meters and contained up to 48 houses compared to the rest of the fortifications that contained up to 16 houses. Aggersborg lies by the Limfjord close to the town of Løgstør.