The Spa at The Joule is an 8,000-square-foot subterranean spa beneath The Joule hotel on Main Street in downtown Dallas. Its European Heat Experience combines a eucalyptus dry sauna, a crystal steam room, a Swedish rainfall shower and an ice fountain, and a heated co-ed vitality pool is inspired by geothermal springs. Eight treatment rooms offer facials, massages and body rituals; guests are advised to arrive an hour early to use the facilities. Open daily 7:30 AM to 9 PM.