If you're eager to add some extra culture to your trip, put MUMI Museum of Mining and Industry on your travel itinerary. Check if guided tours are available or just look around in your own time.
When you've finished at this museum in San Martin del Rey Aurelio, why not make your way to Centro de Interpretacion Armando Palacio Valdes, Museum of the Siderurgy, and Monumento Pozo Fortuna? They're not far from MUMI Museum of Mining and Industry and also popular with tourists.