Gåseborg, Iron Age hillfort in Järfälla Municipality, Sweden
Gåseborg is an Iron Age fortification in Järfälla Municipality that stands on steep cliffs rising above Lake Mälaren. The site features two stone walls built without mortar on its land-facing side.
Archaeological excavations in 2002 uncovered bronze casting crucibles dating from 300 to 500 AD, proving the site was older than previously thought. This discovery shifted understanding of when the fortification was in active use.
The fortification served as a metalworking center where craftspeople processed precious metals to create objects for people of high rank.
You can reach the site via Vattenverksvägen from Hummelmoravägen, which leads to a parking area where the road makes a sharp right turn. The hillfort sits on elevated terrain, so walking around the fortification walls involves some climbing.
The fortification has two entrances with stone slab steps positioned at angles that blocked direct views into the interior. This defensive design shows how ancient builders understood ways to prevent enemies from seeing inside.
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