Construction of Fredriksten started in 1661 after Norway lost the Bohuslän district and Bohus…read moreFortress to Sweden in 1658. Three subsequent attacks by the Swedes on Halden in 1658-1660 convinced Fredrik 3. the King of Denmark and Norway; a strong, modern fortress was needed. During the war in 1718, Swedish King Karl 12. fell before the walls of Fredriksten fortress. Fredriksten is Norway`s largest, most important and most venerable border fortress. Many also find it one of the most magnificent in Europe, majestically located above Halden. It offers a fantastic view of the town and the fjord, and far into what once was enemy territory. Fredriksten fortress is a fantastic arena for wide variety of events, from intimate theatrical performances to large car shows, concerts and sports events. A number of large outdoor areas and smaller freestanding forts are available for use. Managed and maintained by the national association for the preservation of fortresses.