What Fortress used as a palace and prison has the Festning tunnel running underneath it?
Akershus Fortress Akershus Fortress (Norwegian: "Akershus Festning" ) or Akershus Castle (Norwegian: "Akershus slott" ) is a medieval castle that was built to protect Oslo, the capital of Norway. It has also been used as a palace and as a prison.
Malaspina Castle The Malaspina Castle is located in Massa, Italy. It crowns the top of a rocky hill and dominates the wide underlying plain and part of the Tyrrhenian coast. From the 17th century the main purpose of the castle was military and it served as a prison until 1946. The castle was subsequently restored and reopened to the public.