The Caverne du Dragon is an old quarry that was bitterly disputed between the Germans and the French during the Chemin des Dames offensive in 1917
You can only get to the Dragon's Cave by car. There is a parking lot right in front of the entrance. The visits are obligatory in groups and there are departures every half hour during the busy period. The price is 8 euros. The guided tour lasts about 1h30. As in all quarries, it is not warm inside and the humidity level is high. Be careful, the restaurant on the spot is just a snack and you will have to take the car to find a restaurant.