Perched on some precipitous cliffs, the 11th- to 14th-century Forteresse de Mornas, 12km north of Orange, makes a dramatic backdrop for the pretty village below. Built by the medieval Counts of Toulouse, it commands outstanding views west to the Rhône and east to Mont Ventoux.
When tours are not offered, the castle opens for self-guided visits: daily in February, March, October and November, and weekdays from April to June (adult/child €5/3).