What Fortress used as a palace and prison has the Festning tunnel running underneath it?
Festning Tunnel The Festning Tunnel (Norwegian: "Festningstunnelen" ) is a motorway tunnel on European Route E18 in the city center of Oslo, Norway. The tunnel has two tubes, with three lanes in each. It runs from Bjørvika, under Akershus Fortress, The City Hall Square and Vika to Filipstad. The tunnel is 1800 m and -45 m elevation at the deepest.
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.