Calistoga
Spring Town · Calistoga, California
The town at the top of Napa Valley, sitting on a geothermal field that produces both hot mineral water and volcanic ash — which is why it has something almost nowhere else in North America does at this scale: the mud bath, a tub of heated volcanic ash and mineral water you lower yourself into and cannot easily get out of.
1133 Washington Street, Calistoga, California, 94515, United States
Town open year-round. Spa hours vary; book treatments and day passes ahead.