Queribus Castle or Chateau de Queribus, Cathar Castle, Cucugnan, Corbieres, Aude, France. This view shows the steep rocky cliffs of its hilltop location. The castle, built from 13th to 16th centuries, is considered the last Cathar stronghold. It sits on a high peak at 728m. It is one of the &quot;Five Sons of Carcassonne&quot; or &quot;Cinq Fils de Carcassonne&quot;. It is a listed monument historique and has been fully restored, restoration work being completed in 2002. Picture by Manuel Cohen