Torrylin Cairn is the remains of a Neolithic chambered tomb. The cairn has been interfered with by stone robbing and later dumping of field stones and its original shape and size are uncertain. The chamber is 6.7 metres long by about 1.2 metres wide with each compartment about 1.4 metres long. Torrylin Cairn is of a type found across south-west Scotland known as a Clyde cairn, of which a better preserved example can be found at Carn Ban, about 3 miles to the northeast. The tomb would probably have had a crescent-shaped forecourt, framed by a façade of slender upright stones.
Antiquarian excavations in the 19th century uncovered an elongated burial chamber, divided into four compartments. Only the innermost compartment was intact. It contained the remains of six adults, a child and an infant. Beside them lay a flint tool and a fragment of pottery.
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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.