At the base of the cliffs of the garden there is an underground natural cavity in which the limestone rock, excavated by water millennia ago, is dotted with caverns adorned with a great variety of concretions: stalactites, stalagmites, draperies or columns. Open to the public in 1950, the cave, known as the observatory cave, guided by specialists, takes place between altitudes 98 m and 40 m. The cavity sinks practically to sea level, and is regularly traveled by local speleologists.
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Traces of prehistoric human habitat have been found there. A museum of prehistoric anthropology located in the garden exposes several of these discoveries.
