Hollow out lanterns in vegetables. Put candles inside to ward off evil spirits: since the time of the Celts, the end of October has been an exceptional time in Brittany when the visible joins the invisible. It’s the celebration of Samhain, marking the beginning of the dark season, or “Kala goanv” in Breton – still called that in Finistère: the Calends of winter. A few days before the celebration, follow us through sites steeped in legend and haunted castles. Once upon a time, in the West…