
Formed by a karst collapse, Creux Maldru is a fascinating sight with an interesting story. During the French Revolution in 1789, the Civil Constitution of the Clergy reorganised the Catholic church in France, leading to many changes which its members had to swear to abide by. Around half of all priests refused, causing a divide between the faithful and the revolutionaries. Some of these “refractory” priests were persecuted and fled, while others hid to continue performing clandestine masses. The Creux Maldru served as such a hiding place for the priests from the surrounding villages. This period only came to an end in 1801 with the arrangement agreed by Napoléon Bonaparte and the papacy.