Eda Skans is a redoubt built by Gustaf Oxenstierna in 1657 against the threat of Denmark-Norway. It was rebuilt in 1676 and again in 1808. It was demolished when the union between Sweden and Norway was agreed. The restoration began in 1939 and today there isa museum where you can find an extensive collection of weapons, uniforms, paintings, documents and images. There are also findings from the lake Hugn here.
References:The Château de Foix dominates the town of Foix. An important tourist site, it is known as a centre of the Cathars. Built on an older 7th-century fortification, the castle is known from 987. In 1002, it was mentioned in the will of Roger I, Count of Carcassonne, who bequeathed the fortress to his youngest child, Bernard. In effect, the family ruling over the region were installed here which allowed them to control access to the upper Ariège valley and to keep surveillance from this strategic point over the lower land, protected behind impregnable walls.
In 1034, the castle became capital of the County of Foix and played a decisive role in medieval military history. During the two following centuries, the castle was home to Counts with shining personalities who became the soul of the Occitan resistance during the crusade against the Albigensians.