Fosse Dionne

Known to the Romans as Fons Divina — divine spring —, the Fosse Dionne has captivated all who lean over its waters for centuries. Fitted with a half-rotunda roofed lavoir in 1758, its 14-metre circular basin with turquoise reflections conceals an underground gallery whose origins remain partly mysterious. Legend holds that its blue hue evokes the Virgin Mary's mantle, or that Saint Jean de Réome made it spring from the earth by vanquishing a basilisk. Divers have ventured in since 1955; Pierre-Éric Deseigne reached −79.5 metres there in October 2019.

Details may change — please check the official website before your visit.