Akershus Fortress

"Akershus Fortress or Akershus Castle is a medieval castle that was built to protect and provide a royal residence for Oslo, the capital of Norway. The castle has also been used as a military base, and is today a museum, open for public."  Per Wikipedia

Castles, boats, ships, water, sailing, mid-evil era were the highlights of my Scandinavian Capital Tour,  along with the amazing cloud formation.