Aven Armand is a show cave on the Causse Méjean, the wild limestone plateau at the heart of the Cévennes in France's Lozère department, roughly midway between the villages of Meyrueis and Sainte-Énimie. It takes its name from Louis Armand, a locksmith from nearby Le Rozier, who first lowered himself into the shaft on 19 September 1897. He returned the next day with Édouard-Alfred Martel, one of the founders of modern speleology, and fellow explorer Armand Viré — and what they found below the causse's dry surface was one of the largest and most decorated underground chambers in Europe.
The cave's single vast chamber, the Salle de la Grande Stalagmite, is roughly the size of a cathedral nave and holds what's known locally as the Forêt Vierge, or Virgin Forest: close to 400 stalagmites rising from the chamber floor, many of them over a metre tall. At its centre stands the Grande Stalagmite itself, generally cited as the tallest stalagmite inside any show cave open to the public — around 30 metres, built up over an estimated 300,000 to 400,000 years, one thin mineral layer at a time.
Today a funicular carries visitors 60 metres down through the rock in under two minutes, replacing the rope-and-ladder descent Armand and Martel first made. From the funicular's lower station, the guided Jules Verne tour leads on foot through the chamber and its forest of stone, at a constant c.12°C whatever the season outside. We handle the ticketing so your timed departure is confirmed before you arrive — one less thing to plan once you're out on the causse.