The Most Beautiful Spas in the World — and Which Treatments to Try!

Spa overview: There's no cell phone service in this underground oasis, which will help you unwind in the cozy-chic atmosphere. Those dealing with jet lag or mountain sickness can combat both by enjoying a nap in quiet room, adorned with beds, plush blankets, and oxygen masks (it gently blows O2 into your nose to alleviate headaches and dizziness). After your treatment, enjoy a warm cup of coconut tea and dried fruit or sip a crisp glass of Champagne in the coed hot tub with your honey (there's a waterfall wall!). You'll also find hot-and-cold plunge pools and steam rooms in the locker area so you can detox for après-ski.