THE DOLDER GRAND, SWITZERLAND

After a $490 million face-lift, spectacular glass-and-steel wings now curve around the venerable, turreted Dolder, which features a 43,000-square-foot spa with panoramic viewsof Lake Zurich and two new restaurants, one of which just earned a second Michelin star.
Doubles from $574; thedoldergrand.com

EDITION ISTANBUL, TURKEY

Ian Schrager, the godfather of boutique hotels, christened his second Edition property last month, an archminimalist stone-and-wood masterpiece that just might make beige sexy again. And since it's housed in the city that's synonymous with the hammam, the property's ESPA spa is a tri-level modern spin on the traditional Turkish steam bath—all sleek, polished stone and hammered-bronze basins (with the added luxe of leather-floored treatment rooms). Get your hide buffed with updated treatments that use traditional kese mitts, olive soap, milk, and honey. And then cryogenically ease whatever still pains you in the snow cabin.
Doubles from $433; editionhotels.com
Tip: ESPA's startlingly thorough facials employ an ultraviolet Wood's lamp to reveal years of wear and tear, which a therapist treats with a tailored regimen that might include Hawaiian algae or Benzoin oil.

CASTELLO DI VICARELLO, ITALY

After proprietors Carlo Baccheschi Berti and his wife, Aurora, returned to their native Italy from a stint in Indonesia, they created this seven-room medieval Tuscan retreat and added an Asian vibe to the spa. They employ a masseur from Kerala, India, who leads guests through a range of Ayurvedic therapies in the property's eco-conscious wood-and-glass treatment facility. Along with the infinity pool, it's about the only modern addition to this restored 12th-century micro-hamlet surrounded by Vicarello's own vineyard and acres of trail-laced woodland. The resort also presses its own olive oil and grows much of its own produce, which you can help Aurora turn into a delectable supper.
Suites from $540; castellodivicarello.com
Tip: The ultimate way to experience Castello is to rent the whole place, which is the only option during the off-season.

DELAIRE GRAFF, SOUTH AFRICA

This ultra-luxe resort includes a world-class vineyard and spa; 10 lodges, each with an infinity pool; and Indochine restaurant. When you arrive, enjoy the Jet-Lag Detox, and spoil yourself afterward with the Gentleman's Grooming Package and glasses of the multiple-award-winning Cabernets and Sauvignon Blancs.
Lodges from $1,275; delaire.co.za

DAR HI, TUNISIA

Not since Star Wars filmed here has Nefta, Tunisia, seen anything so fantastical as this 17-room walled retreat by the French designer Matali Crasset. The Desert Bauhaus-style structures are scattered around a central courtyard scored by miniature canals. Slip into a pair of babouches and sleep in either a suite on concrete stilts with floating bow windows and outdoor showers, or a "Troglodyte" room inspired by local cave dwellings and lit by skylight. A natural hot spring heats the swimming pool and powers the turquoise-tiled hammam, where local masseurs will scrub and rub you with clay and salt from the nearby Chott El Jerid salt flat.
Doubles from $425; dar-hi.net
Tip: Dar Hi's owners are building a cabin in a nearby oasis and have planted lush, organic gardens in an attempt to reintroduce the lost art of desert farming.

PARROT CAY, TURKS & CAICOS

The COMO Shambhala spa at this classic private-island compound offers a stress-management program run by an Ayurvedic doctor and a treatment menu featuring an acupuncture-shiatsu-massage combo, Javanese-style bath regimens that use oat bran and yogurt, and slippery rhythmic rubdowns in which either a male or a female therapist (your choice—the spa is evenly staffed) does inspired things with warm scented oils. Afterward, golf-cart it back to the main white-washed, day-bed-filled resort for some pool time with Sandy Bullock and Keith Richards.
Rooms from $545; parrotcay.como.bz
Tip: Do as Parrot Cay's celebrities do and spend an evening getting kneaded in the ultra-private Spa Cottage, which has its own steam room, outdoor shower, and, best of all, dinner service.

VICEROY SNOWMASS, COLORADO

The Viceroy chain's antler-modern resort, seven miles from Aspen, brings a lively après-ski scene to an otherwise sleepy—if slope-blessed—village. And if you overdo it on the mountain (or at the bar), refer to the menu at the 7,000-square-foot spa, which offers treatments inspired by Asia (the Kiyoshi Ritual is a facial that includes wasabi extract), the Ute Indians (the Bear Dance Ritual includes a sandalwood-and-fir body wrap), and the ancient Norse (the Sami Zen Energy Ritual has a massage set to Joik chanting).
Doubles from $150; viceroyhotelsandresorts.com
Tip: The new base camp also has three new high-speed lifts, an upgraded snowboarding half-pipe, and a new ski school at Elk Camp Meadows, which is mostly free of cross-traffic from other trails.

THERME VALS, SWITZERLAND

Carved out of a mountain in the remote alpine village of Vals, Pritzker-winning architect Peter Zumthor's minimalist palace features indoor and outdoor pools and baths constructed out of locally quarried quartzite with views of the snow-capped Alps.
Doubles at Hotel Therme (admission to baths included) from $100; therme-vals.ch

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FIVE GREAT DAY SPAS

Beverly Hills: The Peninsula

A reassuring holdover of old-school luxury, this plush, art-filled hotel spa tends to the skin and muscles of L.A.'s power brokers. Schvitz with them in the eucalyptus steam room and over a men's mani-pedi ($120) in the new Nail Suite.
9882 S. Santa Monica Blvd.; peninsula.com

New York City: The Setai Wall Street

This Asian-themed spin-off spa of the midtown Setai hotel gives captains of industry a dose of Zen tranquillity. There's a sports massage, a gentleman's facial, and a $675, three-hour ritual of body and skin therapies performed in a private suite.
40 Broad St.; setaiclubnewyork.com

Miami Beach: The Standard

This chic hotel spa is a coed complex of pools, wet rooms, saunas, lounges, meditation circles, and "play spaces" overlooking Biscayne Bay. Hobnob under the Roman waterfall or escape the scene into a private room for a hot-and-cold stone massage ($205 for 90 minutes).
40 Island Ave.; standardhotels.com