For many decades, who hasn’t heard of the existence of underground structures in the Beauce area? Discovered by chance during agricultural or landscaping works, and even upon ground collapses, these have been studied seriously since the 1960s. The results of the digs proved their use as cult locations.
In one of the underground structures in the Fourneaux locality, vestiges of a cloister still showing seats carved into the tuff were observed, as well as arches, red earth crockery and a terracotta tile. Terracotta tubes were discovered on the other side.