The nocturnal opening of the citadel hillsides is an event taking place on the first Saturday of October. All the private roads and courts, non-residential buildings, country lanes and even some private houses on the hillsides are open through the night and illuminated by thousands of candles. This is the Montagne de Bueren all lit up like a christmas tree.
Several other illumination events and light sculptures could be seen throughout the area, such as these white balloons in the woods
and these projection screens just off the Rue Hors Chateau.
The event culminated with a fireworks display.