Spas with reservation required

Denver, Colorado

Day spa in Denver's Lowry Town Center offering massage, facials and a relaxation lounge, with robes and sandals provided for guests.

Aachen, North Rhine-Westphalia

A suite hotel in central Aachen where each private room has its own jacuzzi and sauna, booked by the night rather than a day pass.

Los Angeles, California

Ayurvedic day spa in Santa Monica offering four-hand massage, Shirodhara and herbal body treatments by reservation, adults and couples only.

Boston, Massachusetts

Day spa in East Boston offering massages, facials, body care and a hydrotherapy circuit, open daily except Sunday with walk-ins welcome.

San Diego, California

Beachfront hotel spa at the Catamaran Resort in Mission Beach offering massages, facials and nail services with a view of Mission Bay.

Los Angeles, California

A medical spa in Silver Lake, Los Angeles offering body contouring, massage, hair removal and skin treatments in private suites, open daily 9am to 10pm.

Palm Beach, Florida

A budget-friendly day spa in Palm Beach Gardens offering massage, facials and a private hot-cold contrast therapy suite, with walk-in access.

Scottsdale, Arizona

A by-appointment skincare and grooming studio in South Scottsdale, run by esthetician Stacey Grondahl, open daily 10am-4pm for men's facials now extended to

Vail, Colorado

Hotel spa at The Hythe in Vail offering treatments and a relaxation lounge, open daily 9am-7pm, reservation required.

Lake Tahoe, California

A small day spa and gift shop in Kings Beach offering therapeutic massage by appointment alongside a lakeview shop of crystals and gifts.

Texas Hill Country, Texas

A medical spa on San Antonio's Far West Side offering massage, facials, injectables and laser hair removal, open weekdays and Saturday mornings.

Hudson Valley, New York

A sensory-deprivation float tank and massage spa in Kingston, NY, near the foot of the Catskills.

Naples, Florida

A Park Shore day spa in Naples offering massages and facials, open daily except Sunday, with a membership club for regulars.

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.

Park City, Utah

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

Tucson, Arizona

Adults-only day spa in Tucson's Triangle area offering lymphatic facials, dermaplaning and a hydrotherapy circuit; 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.

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.

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.

Palm Springs, California

Andreas Hotel & Spa is a hotel spa in downtown Palm Springs with a relaxation lounge, open to hotel guests by reservation.