Akershus Castle is a medieval castle located in Oslo, Norway. Built in the late 1290s, it served as a royal residence and a military fortress. The castle has undergone several renovations over the centuries, reflecting various architectural styles, including Gothic and Renaissance. Today, Akershus Castle is a popular tourist attraction and houses several museums, including the Norwegian Armed Forces Museum. Visitors can explore its historic grounds, enjoy scenic views of the Oslo Fjord, and learn about Norway's rich history through guided tours and exhibitions.