Fontsanta Thermal Spa & Wellness

Mallorca has exactly one source of natural hot springs, and this adults-only resort is built around them. The spa's hydrotherapy circuit is the main event, fed by mineral-rich thermal waters that give the place its name ("sacred fountain"). Stone buildings, beamed ceilings, and linen-upholstered everything keep things quietly unfussy. Breakfast goes under the trees; a private beach club sits on Es Trenc. The Michelin Guide awarded it one Key.