Aver­age water tem­per­a­ture: Bub­bles up at 115°F, with pools main­tain­ing tem­per­a­tures between 85 and 106°F
Tucked into a scenic canyon in the Brad­shaw Moun­tains just an hour from Phoenix, Cas­tle Hot Springs has been lur­ing tourists since the late 1800s – and Indige­nous peo­ples for far longer – with its heal­ing waters. Now an all-inclu­­sive lux­u­ry well­ness resort, this des­ti­na­tion is well worth an overnight stay, thanks to excep­tion­al stargaz­ing at night, a thrilling onsite via fer­ra­ta course and (nat­u­ral­ly) 24-hour access to min­er­al hot springs that cas­cade across three pools of vary­ing tem­per­a­tures.
Open to resort guests only, the geot­her­mal hot springs here are rich in cal­ci­um and nerve-calm­ing mag­ne­sium as well as lithi­um, which has been called the “hap­py min­er­al” for its mood-sta­bi­l­iz­ing prop­er­ties. Take a soak sur­round­ed by tow­er­ing saguaro cac­ti, palms and lay­er upon lay­er of weath­­er-worn rock, col­ored pur­ple and rusty red from the spring’s min­er­al con­tent.