The German surrender of Akershus Fortress on 11 May 1945.
Several individuals were executed at Akershus, including Norwegian traders after the war. Among those executed was Vidkun Quisling, who's charges involved his revocation of the mobilization order, his encouragement of Norwegians to serve in the Norwegian SS division, his assistance in the deportation of Jews, and his responsibility for the execution of Norwegian patriots and a number of other charges.
Akershus was also used a prison up until the 19th century, housing infamous prisoners such as the "thief of the people" and author Gjest Baardsen.
Today, the castle is open daily for visitors until 9pm, however the premises is still being used as a military base. On your tour, you will be able to see Norwegian Royalty which have been buried in the Royal Mausoleum in the castle. They include, King Sigurd I, King Haakon V, Queen Eufemia, King Haakon VII, Queen Maud, King Olav V and Crown Princess Märtha.