Field stones from Wisconsin line the walls of a hallway that leads to 10 treatment rooms, four shower rooms, a mediation area, and an infrared sauna. When booking the spa for an event, planners can arrange for treatments on site, and the spa can also provide guests with gift certificates for services.

Eco-friendliness rules the construction throughout: In the nail room, walls are made of reclaimed wood from a Midwestern barn (some slabs still contain traces of red paint), and manicurists work at tables made from fallen trees. Massages take place in dim rooms lined with sound-absorbing cork floors, and in the center of the spa, a spacious, tented meditation room provides seating made of adobe cob.

The ode to Mother Earth theme extends from the spa's construction to its decorations. Throughout Allyu, ancient artifacts from countries including India and Thailand appear. In the hallway, for example, guests come face to face with a Ganesha statue thought to be 1,100 years old. "I display objects from cultures that are earth-honoring," spa owner Tamara Wills explained. Though she welcomes any caterer to provide food for events at Allyu, Tamara recently partnered with Greg Christian Catering, a company whose focus on organic fare and composting is in keeping with Wills's beliefs. For spa events for five to 200 guests, Greg Christian can provide boxed lunches, appetizer spreads, or executive lunches.   —Jenny Berg