Set at the heart of Calistoga Ranch, An Auberge Resort, within a box canyon deep in the Napa Valley, this petite but full-service spa has been designed with a mere 1,600 square feet of indoor space. Another 3,500 square feet of outdoor space incorporates the spectacular natural surroundings of Northern California, completely immersing spa guests in the canyon setting. Guests enjoy their spa treatments on private decks that overlook views of mountains and the resort’s own private lake. The spa elements are enhanced with open-air showers and thermal mineral pools in secluded garden settings. The lobby and relaxation area is entirely outdoors, with outdoor fireplaces as gathering points.