The first part of the cave (Aguzou 1 on the map) was already known in prehistoric times because of its healing waters. It was developed as a thermal resort at the beginning of the 20th century.

A second network of galleries was discovered in 1965. Another 6 km (4 miles) of breathtaking galleries were found, 1500 m (1600 yd) of which are now open to the public.

The cave is still absolutely natural: there has been no artificial lighting installed, and no ostentatious arrangements. Visits are organized for small groups only, in the form of an underground hike. Equipment supplied: helmet, lighting and suit.

There is a diversity and profusion of minerals in the cave, including aragonites, Helictites (eccentrics) and triangular crystals. This is one of the most beautiful caves in Europe, part of a geological heritage we must preserve for future generations. It also represents a journey in time and space deep in the underground world of our planet.