This is a simple route, inside the city and its immediate proximity, that includes scientific aspects (geological, hydrological, paleontological, geomorphological) and ethno-environmental aspects (stone culture, legends, ancient tools, sculptures...).

A journey to discover fossils and geological events, which can be found in pavements, in monuments building stones, in decorations, in outcrops and in caves of the old town.? This represents a different way to approach the historic architecture, the artistic stone processing, the geological history of an area that fascinates geologists, naturalists as well as amateurs.