Sweden
Gåseborg ranks #7,912 of 9,040 worldwide in the atlas's castle fame ranking, and #203 of the 209 mapped in Sweden. 30 more atlas landmarks stand within 25 km. The nearest day-trip guide is Stockholm, 19 km away. See how Sweden compares in the castle statistics.
Gåseborg is a prehistoric hillfort in the Lake Mälaren district in Sweden. The scientists don't know for certain, but most likely it was built to supervise and control the water fairway below the fort, probably sometime during the late iron age (500-1100 AD). Several major fairways passed right here and from this place the local man in power could control the traffic to Uppsala, Sigtuna, Birka and the western districts of Lake Mälaren.
Text adapted from “Gåseborg” on Wikipedia, CC BY-SA 4.0.
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