The 8 Best Hot Springs Hotels in the U.S. - AFAR

"A Napa Valley thermal resort where four on-site geysers feed mineral water into an Olympic-sized main pool (dating to 1913) and a quieter adults-only pool, continuing a bathing tradition that began in the mid-19th century. The property blends wellness and wine-country leisure, offering five accommodation styles from adult-only lodge rooms to larger houses and bungalows, an on-site restaurant added in recent expansions, and classic spa rituals such as volcanic-ash mud baths followed by mineral soaks—an iconic Calistoga experience that emphasizes both relaxation and local terroir." - Michelle Baran