On the road from Val d'Orcia to Monte Amiata, follow the sign saying 'Bagni di San Filippo' and you will end up in a river which is a natural spa, thanks to calcium and sulphur present in the water. The hottest pools are the ones right under the waterfalls coming from the big calcium rock, called White Whale. #lamiaitalia #tuscany #free #livelocal #thermalbaths