1 Best Sight in Napa and Sonoma, California

Newer, fancier establishments might have eclipsed Dr. Wilkinson's, but loyal fans appreciate its reasonable prices and unpretentious vibe. The mud baths here are a mix of volcanic ash and Canadian peat, warmed by the spa's own hot springs. Fun fact: back in 1952, "The Works"—a mud bath, steam room, blanket wrap, and a massage—cost $3.50; the charge now is $149.