Dans Gallia Christiana (Tomme II, p. 411), Saint Coust est mentionné comme une fondation de l'abbaye clunisienne de Mozac. La première citation "Ecclesiam de Sana Cultura" apparaît dans un placard …
"The waterfall of the 3 vats of Chambonnet is one of the best kept secrets of the Combrailles. The Cubes stream descends successively into 3 natural potholes and forms a waterfall, in the heart of the forest. (Combrailles Auvergne Tourisme)."
Remains of a Carthusian monastery, founded in the 13th century. The site being maintained, it is possible on site to learn more about this site listed as a historical monument.