Mineral Baths, Saturnia Tuscany, Italy. Terme di Saturnia are a group of lush geothermal springs located in the municipality of Manciano, just a few kilometres from the village of Saturnia, Italy. The thermal waters of Saturnia have a series of cascades at 37°, where nature forms dozens of beautiful pools at different levels. It's free, warm, and has a gorgeous view overlooking Tuscany. The mud is even good for your skin! I loved relaxing with a dozen Italians. One of our favorite spots.