I did travel about 15 minutes from Viterbo to a volcanic hot spring that was also a spa, restaurant, and hotel. It's known as the Salus Terme. I went swimming in the hot spring, used their cold exposure benefits health areas, went to get spa treatments, went to the sleep area which is for after, or before treatments, the saunas, the relaxation room where theres loungers, and free tea bars, and stayed several times overnight in the hotel. The getaways were so relaxing and got my mind centered and prepare for the upcoming weeks adventures. Also seeing a natural volcanic heated hot spring was a cool phenomenon you could see the safe levels of volcanic gases, and steam.