In the Exotic Garden, 100 m above sea-level, at the foot of the cliff, there is an underground cavity adapted for visits. (Its name comes from the presence of a small astronomical observatory at one time). The limestone rock, hollowed out by water high in carbon dioxide, is dotted with caverns decorated with concretions with evocative names: stalactites, stalagmites, draperies, columns, spaghetti…
The visit to the cave, included in the entry ticket for the Exotic Garden, is conducted by specialists. It takes place between 98 m and 40 m (about 300 steps). The cavity plunges almost to sea level and is regularly used by local potholers.
The presence of prehistoric man in the vicinity of this cave has been proved by the remains of bones of the animals that provided them with food. These remains also confirm the climatic variations which have taken place in the last 250,000 years.
The collections at the PrehistoricAnthropologyMuseum form an excellent complement to the visit to the Cave.