"When Murietta Hot Springs opened in 1902, it quickly became the respite of choice for southern Californians. The storied resort located between L.A. and San Diego re-opened in February after a 30-year-closure and history is certain to repeat itself thanks to re-imagined facilities, including a spa that focuses on traditional hydrothermal treatments, a wine bar and restaurants, plus a fitness center that offers creative classes like aqua sound bathing. A steam room, panoramic sauna, cold plunge, and terra thermal mud loft are housed in the historic bathhouse. But the steamy, mineral-rich waters remain the main draw. More than 50 geothermal pools, cold plunges, and water features are scattered across the 46-acre property. Day passes are available, but overnight guests get 24-hour hot springs access and can upgrade to specially designed Sleep Rooms with Bryte Balance beds and ambient soundscapes machines. Essential experience: After a soak, hit the spa for a super hydrating honey-avocado body treatment."