Those of us who love to sink into a tub of Calistoga mud realize that plenty of people think the very idea is gross. My friend Cheryl and I don't care. At the end of The Works at Dr. Wilkinson's or ...

It’s 8 in the morning, and I’m encased in prime Napa Valley volcanic mud at Solage, an eco- resort that opened last summer in Calistoga, California. As I recline on a raised stone slab in a small, hot ...

Submerged in a mucky peat brine, it occurs to me that this must be the strangest bath I have ever taken. I'm in the well-preserved Czech spa town of Třeboň. I've decided to supplement my intense time ...