Set within Arizona’s storied Bradshaw Mountains, Castle Hot Springs brings a renewed expression of heritage-rich desert luxury to the Relais & Châteaux 2026 collection Relais & Châteaux  has officially welcomed  Castle Hot Springs  — a historic, adults-only luxury desert retreat in Arizona’s Bradshaw Mountains — to its esteemed collection of 580 unique, independently operated hotels and restaurants worldwide, joining nine other new members announced by the association this se