Akershus Fortress is a medieval castle located in Oslo, Norway. Built in the late 13th century, it served as a royal residence and military stronghold. The fortress has played a significant role in the country's history, particularly during conflicts and wars. Today, Akershus Fortress is a popular tourist attraction, offering guided tours and exhibitions. Visitors can explore its historic buildings, including the Akershus Castle and the Norwegian Armed Forces Museum. The fortress also provides stunning views of the Oslo Fjord and the surrounding cityscape.