This museum is the best place to understand why Caltanissetta mattered in the 19th and early 20th centuries. Central Sicily's sulphur mines brought money, hard labour, and a social history that is far darker than the city's calm streets suggest.
The collection covers minerals, fossils, mine equipment, maps, and photographs from the sulphur districts. It is not just a specialist stop: it gives the city a clear story and makes the surrounding dry hills read differently afterwards.