The sulfurous, effervescent waters of Murrieta Hot Springs have long attracted visitors. Native American petroglyph and pictograph images directed weary travelers to the springs where Juan Murrieta later bathed his sheep and a San Diego firm laundered clothing. In 1902, an enterprising German immigrant named Fritz Guenther developed acreage around the springs into a world-class resort and health spa at the Murrieta Hot Springs. After the Guenther...