The Château de Quéribus is a ruined castle in the commune of Cucugnan in the Aude département of France. It has been listed as a monument historique by the French Ministry of Culture since 1907.
Queribus is one of the "Five Sons of Carcassonne", along with Aguilar, Peyrepertuse, Termes and Puilaurens: five castles strategically placed to defend the French border against the Spanish, until the border was moved in 1659.
It is sometimes regarded as the last Cathar stronghold. After the fall of Montségur in 1244, surviving Cathars gathered together in another mountain-top stronghold on the border of Aragon.
Wikipedia https://en.wikipedia.org/wiki/Château_de_Quéribus
Address 11350, France
Coordinates 42°50'12.431" N 2°37'17.433" E