The Spa at Solage, part of the Auberge Collection at Solage resort in Calistoga, California, is a 20,000-square-foot sanctuary where Napa Valley's celebrated mineral traditions and contemporary wellbeing converge. Mineral-rich volcanic mud and healing geothermal waters are at the heart of the experience, continuing a legacy of thermal bathing that has drawn wellness seekers to the region for over a century. The Bathhouse offers a circuit of geothermal pools ranging from invigoratingly cold to a soothing 104 degrees Fahrenheit, while the signature Mudslide treatment guides guests through a mineral mud application, a private geothermal soak, and restorative time in a unique sound chair. Additional offerings include massages, facials, infrared sauna, eucalyptus steam room, and fitness center access, all set amid the breathtaking landscape of the Napa Valley wine country.