Aggersborg, Viking ring fortress at Limfjord, Denmark
Aggersborg is a circular fortress roughly 240 meters across, surrounded by an earthen rampart. Four gates align with the cardinal directions, and the layout of approximately 48 longhouse foundations remains visible beneath the turf.
The site was built around 980 under King Harald Bluetooth to control ships and goods moving through the Limfjord. It stood as a display of royal power at a strategically important location.
The name comes from the nearby Agger River, meaning "fortress by the Agger". Walking around today, you can trace the rampart edges and see where wooden buildings once stood marked in the grass.
The site is open year-round and free to explore, with information panels and parking available. The flat ground and marked paths make it easy to visit for people of all abilities.
Around 48 longhouses once stood within the ramparts, with each structure requiring roughly 66 large oak trees. This enormous amount of timber reveals the resources and organization needed to build such a place.
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