Eynhallow Church is probably the ruin of a 12th-century Benedicitne monastery. Because of the name of the isle it is likely that Eynhallow was an important religious centre. Eyin-Helha is Old Norse for Holy Isle.
Eynhallow Church was deserted before the reformation (circa 1560). The church was converted into dwellings in the 16th century. In 1851 the inhabitants of Eynhallow were transferred elsewhere and the church and other buildings were stripped of their roofs. The ruin was consolidated by W.R. Lethaby in 1897.
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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.