Visit Oslo by Fredrik Naumann

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Tourists visit Akershus Fortress (Norwegian: Akershus Festning) or Akershus Castle (Norwegian: Akershus slott) , a medieval castle that was built to protect Oslo, the capital of Norway. It has also been used as a prison...Cruise ship now docks right next to the fortress...The first construction on the castle started around the late 1290s, by King Haakon V, replacing Tønsberg as one of the two most important Norwegian castles of the period (the other being Båhus). It was constructed in response to the Norwegian nobleman, Earl Alv Erlingsson of Sarpsborg's earlier attack on Oslo.