Pagosa Springs, Colorado

From Chicago Tribune:

"For generations — since the Ute American Indians lived on the land — the springs have been said to have healing powers ("Pagosah" is Ute for "healing waters"). The sulfur, chlorides and magnesium have been said to cure everything from arthritis to paralysis."

References:
Winter plunge: At Colorado hot springs, it's swimsuit weather even as snow flies. Chicago Tribune, 10/2010.