2. Chateau de PeyrepertuseDuilhac Sous Peyrepertuse Rennes-le-Château is a small commune approximately 5 km south of Couiza, in the Aude department in Languedoc in southern France. This small French hilltop village is known internationally, and receives tens of thousands of visitors per year, because of various conspiracy theories, about an alleged buried treasure discovered by its 19th-century priest Bérenger Saunière, the precise nature of which is disputed by those who believe in its existence. From Wikipedia, the free encyclopedia.