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Many establishments tout their low impact on the environment, but Calistoga Ranch in California takes green to a new level. Its harmony with the Upper Napa Valley's pristine wilderness makes it an obvious choice for a nomination for a Readers' Choice Award in Luxist's best green spa category.

Founded in 2004, Calistoga is nestled in a secluded canyon a mere 90-minute from San Francisco by car. Set on 157 acres, the resort boasts 47 guest lodges and 27 owner lodges, all of which are designed to share the feel of a vintner's estate. The lodges were all built to ensure that the area's streams, lakes and ancient oak trees wouldn't be disturbed; each lodge features floor-to-ceiling glass doors that create a seamless flow into the resort's copious outdoor deck space.

Gallery: More from the Calistoga Ranch

Calistoga's spa is adorned with warm wood and encircled by trellised walkways. Relax in soaking pools shaded by mossy oaks above and graced by a babbling brook below or head inside to receive organic treatments in a private room. Afterwards, recline on deck chairs and gaze out into the expansive forest before you.

Try the spa's "Calistoga Cure" treatment, an exfoliating salt body scrub followed by a mineral bath in your own private outdoor tub, a polarity session, and a massage. Or check out the "Soul Soother," which begins with a yoga session in your own lodge and continues with an aromatherapy massage at the spa and ends with a lunch at the onsite Lake House restaurant – all without ever leaving your personal Napa paradise.

Cast your vote for your favorite spa until March 31st. Winners will be announced on April 1.

Tucked away in a dense rain forest on the northwestern coast of Australia, Daintree Eco Lodge & Spa's location alone suggests harmony with the environment. Coupled with the resort's careful construction and natural relaxation therapies, it's an easy choice for a nomination in Luxist's best green spa category.

Just 90 minutes by car from the city of Cairns, Daintree is nestled in the middle of the world's oldest living rainforest, the Greater Daintree Rainforest, which has existed for some 110 million years. The family-owned and operated resort boasts 15 treehouse villas, bringing guests right into the thick of the primeval forest. The surrounding area is home to 430 recorded species of bird, 200 species of fish and 70 types of crustacean.

Gallery: More from Daintree Ecolodge & Spa

The lodge was created under the strictest guidelines of the World Wildlife Federation. All of Daintree's water is drawn from nearby natural springs, and the staff uses only biodegradable cleaning agents. The lodge's Julaymba restaurant serves locally-sourced food with seasonal specials, and many of the products used in the organic spa are grown on-site.

The spa itself offers a range of treatments, all of which have been approved by the elders of the aboriginal Kuku Yalanji tribe. Start with "Purely Bathing" ($80), a half-hour soak surrounded by essences of coconut and lime Continue with Daintree's signature treatment, the Walbul-Walbul ($295), a three-hour exfoliation where you'll be cocooned in warm mud, emulating the transition of caterpillar to butterfly.

Cast your vote for your favorite spa until March 31st. Winners will be announced on April 1.

Exhale, a nominee for a Readers' Choice Award for Best Day Spa is widely recognized for revolutionizing the day spa business.

Exhale is a brand synonymous with transformation and healing. In just six years, Exhale has earned a position as a leading lifestyle brand in the health and wellness space. Exhale's large and dedicated following is a result of its proprietary transformational programs and services, seasoned team of industry veterans, and hand selected healers dedicated to helping guests on their journey to inner and outer well-being.

Exhale's active and multi-disciplinary approach combines fitness and movement with spa and healing therapies in a modern, tranquil day spa setting. Transformational group fitness classes include yoga and its proprietary Core Fusion®, Core Fusion® Sport, and Core Fusion® Yoga classes and personal training. Along with relaxing massages and restorative body therapies, results-oriented facials include a full range of body scrubs and massages using the latest technological advances, and healing services that include detox and cleansing programs, acupuncture, cupping, and nutrition. Grooming services, including waxing, nail care, eye care, workshops, and destination weekend retreats round out its unique service offerings.

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Deep within the lush rain forest of Costa Rica, Tabacón Resort is a nominee for a Luxist Awards' Readers' Choice Award for Best International Spa. Tabacón Grand Spa & Thermal Resort is committed to sustainable tourism with a core mission that includes the protection and improvement of the environment.

Tabacón Resort is an oasis embedded in a primary rain forest, featuring twelve natural thermal spring pools and lagoons, waterfalls, exotic gardens and trails. Geologically, Tabacón Resort's hot springs are 97% rain-based and 3% magma-based. The resort is a three hour drive (150 km) north of the San José International Airport. The resort sits near the base of Arenal Volcano, and is surrounded by the wildly diverse flora and fauna of the tropical rain forest.

Gallery: More from the Tabacon Grand Spa Thermal Resort

Should you find yourself in Buenos Aires looking for a spa that caters to gentlemen, look no farther than Markus Day Spa For Men. There, you can chose from an array of treatments for face, body, hair, hands and feet – all of which have earned Markus the title of "El Primer Spa Masculino."

Founded in 2005, Markus was designed to create an atmosphere of harmony and tranquility. Water fountains and fish tanks abound; dim lighting and wood accents pervade the establishment. Check into the Aqua Room and relax with up to eight friends or business partners in a large marble Jacuzzi. Sip tea or champagne while receiving reflexology treatment on your feet. Enjoy the "Adore Me" treatment – three hours of bliss including a face and body scrub, tantric massage, and even a tea serving.

Gallery: Markus for Men

Markus offers more than just relaxation. With a trained medical staff on call, the spa doubles as a tranquil place to receive aesthetic medicine. Botox injections and refill are available on demand, as are peelings, hair implants and plastic surgery. Best of all, the prices are much cheaper than similar procedures stateside.

Outings to Markus can be purchased individually or in bulk. A range of corporate packages are available at discounted rates and include a combination of hair cut, shave, facial and deep tissue massage. Sorry, ladies, Markus is only for caballeros.

Cast your vote for your favorite spa until March 31st. Winners will be announced on April 1.

The connection between the Plaza Athénée and Christian Dior dates back to 1947, when the fashion house's namesake and founder chose the hotel as a place to photograph and showcase his models. Soon he began to invite his best customers there for lunch, or eat by himself in a private dining room. Dior even named a couple of his designs "Plaza" and "Athénée."

Gallery: Dior Institute Plaza Athenee

The Dior Institut was established to promote Christian Dior's goal to make women "prettier and happier," with a focus on reversing the effects of aging. The spa boasts five individual treatment rooms, including a VIP couples' room. There is also a fitness center, a sauna and a steam bath on the premises for clients to relax in after receiving treatments.

The typical treatment at Dior begins with a "Lifting 3D" massage, designed to raise energy levels and transform the guest's posture. Next, micro-abrasion revitalizes tissues and skin. Finally, Dior's anti-aging potions are applied to stimulate, reoxygenate and decongest skin. What better way to prepare for a night on the town in the City of Lights?

Cast your vote for your favorite spa until March 31st. Winners will be announced on April 1.

Gallery: More from Chuan Body & Soul in Hong Kong

Once inside Chuan's sanctuary, choose from a wide range of relaxation options. There's the 1.5-hour Body Elements treatment, which starts with a harmony massage and ends with a facial hydration treatment. For something a little longer, try the Serenity Shen, which begins with a stone therapy massage and continues with a cool marine algae facial mask treatment and finally finishes with an indulgent foot treatment.

If you can't make it all the way to Hong Kong, never fear. Chuan boasts locations in Auckland, Melbourne, Koh Samui, Shanghai and Boston, with more locations planned for Bangkok, Beijing, Guangzhou, Phuket, Pune, London and Los Angeles. Unlike many of its compatriots in the Best Men's Spa category, Chuan is also open to women.

Cast your vote for your favorite spa until March 31st. Winners will be announced on April 1.

Gallery: More from the Peninsula Hotel, Hong Kong

Developed by industry giant ESPA, the spa offers body treatments and skincare with techniques borrowed from European and Asian tradition. The establishment's 14 rooms are adorned with reclaimed wood, green bamboo and indoor waterfalls; most offer views of the shimmering skyline on the other side of Victoria Harbor.

Treatments include "De-Stress," a massage with frankincense oils and a skin-specific facial (120 minutes: $250), as well as "Time Together," a couples' aromatherapy massage complete with full-body exfoliations and a steam bath (120 minutes: $650). If that's not enough relaxation, have afternoon tea in the lobby or dinner at iconic onsite restaurant Felix, which was designed by Philippe Starck.

Cast your vote for your favorite spa until March 31st. Winners will be announced on April 1.