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.
Bridge of Sighs The Bridge of Sighs (Italian: "Ponte dei Sospiri" ) is a bridge located in Venice, northern Italy. The enclosed bridge is made of white limestone, has windows with stone bars, passes over the Rio di Palazzo, and connects the New Prison ("Prigioni Nuove") to the interrogation rooms in the Doge's Palace. It was designed by Antonio Contino (whose uncle Antonio da Ponte had designed the Rialto Bridge) and was built in 1600.