Fredrikstad is located in the county of Oestfold, being a place that is crossed by the Glomma River, flowing in the sea. A military attraction in Fredrikstad is Fort Kogsten, which can be considered a museum. The Fort was built in 1685 and had the mission to defend Fredrikstad, being one of the utmost defence points in this location. Visiting this museum will allow you to see military techniques used in the past.