Mjøskastellet, Medieval castle ruins on Steinsholmen island in Lake Mjøsa, Norway
The stone structure measures 18 by 20 meters with walls three meters thick, standing at the northern end of Lake Mjøsa near Moelv.
King Håkon IV Håkonsson ordered the construction of Mjøskastellet around 1230 to control water traffic and maintain authority during regional conflicts.
The castle site represents medieval Norwegian architecture and demonstrates the methods of constructing fortified structures using local limestone materials.
Visitors can reach the castle ruins by traveling to Steinsholmen island, located just outside Ringsaker Church in the Ringsaker Municipality.
The structure stands as Norway's largest medieval tower building, later serving as a state prison nicknamed Mjøsas Alcatraz.
GPS coordinates: 60.90656,10.69032
Latest update: March 3, 2025 15:26
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