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.
Franzensfeste Fortress Franzensfeste Fortress (Italian: "Forte di Fortezza" ; German: "Festung Franzensfeste" ) is a fortress situated in a village Franzensfeste, in South Tyrol, Italy.