Château de Peyrepertuse Roussillon

Peyrepertuse is the largest of the Cathar castles, teetering on a sheer spur of rock with a drop of 800m on either side. Several of the original towers and many sections of ramparts are still standing. In early August, the castle holds falconry displays and a two-day medieval festival, complete with knights in armour. It's 51km northwest of Perpignan via the D117.