Spas with reservation required

Mexico City, Ciudad de México

An adults-only day spa for couples on Paseo de la Reforma in Cuauhtémoc, Mexico City, open daily from 9am to 8pm.

Chicago, Illinois

A Gold Coast medical and day spa combining massage, facials, laser and injectables with a robe-and-locker relaxation lounge, open daily except Tuesday and

Tepoztlán, Morelos

A day spa and temazcal (traditional Mexican sweat lodge) in Tepoztlán, Morelos, open Wednesday through Sunday with reservations suggested.

Tucson, Arizona

A Japanese-style head spa in a Tucson medical plaza, offering scalp treatments and massage with walk-ins or booked appointments.

Boston, Massachusetts

A moderately priced day spa for adults in Boston's South End, open daily with both walk-in and reservation options.

Park City, Utah

Hotel spa at Mayflower Mountain near Deer Valley with massages, facials, a sauna, relaxation lounge and couples treatments; reservations required.

Houston, Texas

A hotel spa inside The Laura Hotel in downtown Houston offering massage, facial and nail treatments for solo visitors, couples and groups.

Berkshires, Massachusetts

A Great Barrington wellness studio focused on detox therapies like colon hydrotherapy, infrared sauna and liver flushes, by appointment only.

Hudson Valley, New York

An outdoor spa on the Hudson River in Kingston, NY, with two waterfront barrel saunas and garden massage cabins, reservation required.

Arima Onsen, Hyogo

Hotel spa in Arima Onsen with Arima's rare iron-rich "ginsen" waters, outdoor baths, sauna and jacuzzi, run as an all-inclusive overnight stay.

Boston, Massachusetts

A day spa on Lewis Wharf in Boston's North End, open daily 8am–9pm, geared toward adults and couples at moderate prices.

Çeşme, İzmir

A day spa in Çeşme's Dalyan district near Alaçatı, open daily 10am to 11pm, geared toward adults and couples with reservations required.

New York City, New York

A small Japanese-style bathhouse near Union Square with sauna, hot-tub onsen, cold plunge and a recovery lounge, open by reservation only.

Prague

A beer-spa and wellness venue in Prague's Nové Město district offering beer-bath tubs, massages, and a saunarium, open daily from 11am to 11pm.

Catskills, New York

A small day spa in West Hurley near Woodstock offering facials, massage, waxing and advanced skincare, founded by esthetician Debbie Dougan.

Taos, New Mexico

A boutique skin and body studio in Taos offering facials, lymphatic massage, Endermologie and head spa treatments by appointment.

Catskills, New York

A Catskills retreat center with a Tibetan-style spa offering sauna, steam, pools and cold plunge, built around overnight stays and group programs.

Sedona, Arizona

A 23-casita destination spa resort inside Sedona's Boynton Canyon, open to overnight hotel guests 16 and older for multi-day wellness journeys.

Lake Tahoe, California

Small day spa in Tahoe City offering massage, energy therapy and facials, plus an apothecary and gift shop, a few steps from the lake.

Kyle, Texas

A 88-acre Hill Country resort near Kyle and Wimberley with overnight rooms, a garden spa, pool, hot tubs and day-pass access by reservation.

Seattle, Washington

A downtown Seattle yoga studio with heated and unheated vinyasa, sculpt and hatha classes, plus a sauna, steam room and pools for after class.

Asheville, North Carolina

An overnight-stay forest retreat near Fairview with private cedar hot tubs and a shared sauna pavilion session, not a drop-in day spa.

Aguas Calientes, Cusco

A budget-friendly day spa in Aguas Calientes near Machu Picchu, open daily 8am-10pm for massages and treatments close to the train station.

Tulum, Quintana Roo

A hotel spa in Tulum's SM 15 area that requires advance reservations and is geared toward couples and small groups, priced in the upscale range.