Spas with reservation required

Seattle, Washington

An adults-only wellness studio near Green Lake with private infrared sauna suites, therapeutic massage and red light therapy by reservation.

Cotswolds, England

A woodland sauna and ice bath venue near Northleach in the Cotswolds, offering communal and private heat-and-cold sessions plus occasional workshops.

Scottsdale, Arizona

Hotel spa at the Inn at Eagle Mountain in Fountain Hills with sauna, steam room, pools and a $69 60-minute massage as its signature treatment.

Seattle, Washington

Japanese-style head spa in Belltown offering scalp treatments and bodywork from $55, open daily 10am to 10pm, reservations needed.

Seattle, Washington

Neighborhood day spa in Madison Valley offering massage, sauna and float sessions by appointment, no walk-ins or day passes.

Sedona, Arizona

A moderately priced day spa in Sedona with outdoor gardens, a hot tub and fountains, known for its Prickly Pear Pomegranate body treatment.

Antalya

A 15th-century hamam in Antalya's old town booked out entirely for one party of up to two, with a male therapist for all treatments.

Nashville, Tennessee

Massage-focused day spa in Nashville's Waverly neighborhood offering standard, deep tissue, couples and group sessions with walk-in availability.

Portland, Oregon

A reservation-only head spa in Vancouver, WA, just across the river from Portland, focused on scalp, face and hand treatments plus a post-service relaxation

San Diego, California

Grantville day spa in San Diego pairing scalp/head spa treatments with Thai and other massage styles, open daily with walk-ins accepted.

Lake Tahoe, California

A massage-and-facial day spa in South Lake Tahoe's Heavenly Village, open daily 10am-9pm, with couples treatments and a signature package at $320.

Las Vegas, Nevada

Adults-only hotel spa inside Westgate Las Vegas offering massages, facials, salon services, sauna, steam room and a thermal pool, open daily 9am-6pm.

San Francisco, California

Valencia Street studio in Dolores Heights focused on lymphatic body sculpting and facials, including its signature Face Sculpt.

Naples, Florida

A small, moderately priced day spa in East Naples offering massage and a sauna, open daily with walk-ins accepted.

Asheville, North Carolina

A Japanese-inspired destination spa on a mountainside outside downtown Asheville, built around private outdoor salt hydrotherapy tubs and massage.

Sierraville, California

A non-profit hot springs retreat near Lake Tahoe with natural spring pools, reservation-only day and evening soaks, camping and rooms, closed Mondays and

Carmel-by-the-Sea, California

Upscale day spa in Carmel-by-the-Sea's Golden Rectangle with sauna, steam, cold plunge and thermal pools, open daily from 6:30am.

Asheville, North Carolina

A boutique day spa inside Haywood Park Hotel in downtown Asheville, offering facials, massage and couples treatments with free valet parking.

Denver, Colorado

A three-room day spa in Five Points offering massage, facials and head spa treatments, reservation only, with a signature 80-minute massage-facial combo.

Seattle, Washington

A reservation-only social wellness sauna spa in Renton (serving the Seattle area) with a thermal pool, cold plunge, sauna and steam room, day passes from $75.

Mumbai, Maharashtra

An upscale Ayurvedic retreat in Vile Parle West, Mumbai, with five treatments, couples rooms and a relaxation lounge; reservations required, open daily

Sopot, Pomerania

A medical resort spa in Sopot built around local brine and mud treatments, open to hotel guests by reservation rather than day visitors.

Santa Barbara, California

A downtown Santa Barbara day spa built around a private infrared sauna, salt room, cold plunge and a sound-and-light meditation pod, booked by appointment.

Austin, Texas

Adults-only hotel spa at the Fairmont Austin with nine treatment rooms, a hydrotherapy circuit, sauna and cold plunge, open daily with day passes available.