Spas with reservation required

Barcelona, Catalonia

Rooftop day spa at Casa Bonay hotel in Eixample with dry sauna, hammam, ice bath and a Japanese ofuro, booked by small-group circuit or free use.

San Diego, California

A budget-friendly massage and medspa in Core-Columbia, San Diego, with private suites, a sauna and a couples treatment room.

Ojai, California

A family-owned day spa in Ojai, California, open six days a week, offering personalized skin treatments with walk-in and reservation options.

Raleigh, North Carolina

A North Raleigh day spa specializing in the Kranial Flush, a scalp and cranial treatment, alongside body work, face and hair therapy.

Palm Beach, Florida

A day spa in Palm Beach Gardens offering massage, facials, HydraFacial, cosmetic treatments and nail care, open daily except Sunday.

Spring, Texas

Adults-only day spa in Spring, Texas (Houston area) offering massage, facials and body treatments, with walk-ins welcome though booking ahead is advised.

Hong Kong

A hotel spa on the 116th floor of Hong Kong's ICC tower, known for cryotherapy and Forbes Travel Guide five-star recognition.

Orlando, Florida

Halotherapy day spa in Orlando's Lake Eola Heights offering salt room sessions, massage and acupuncture, adults only, by reservation.

Lake Tahoe, California

A wellness center in Kings Beach offering massage, yoga, acupuncture and counseling, open daily with walk-ins and reservations accepted.

Siem Reap

Budget day spa on Sok San Road in Siem Reap offering Khmer, Thai, Swedish and deep tissue massage plus scrubs, wraps and facials from $5.

Las Vegas, Nevada

A moderate-priced day spa in Desert Shores, Las Vegas, offering massage, facials and body treatments by appointment, open seven days a week.

Houston, Texas

Physician-guided medical spa on the second floor of the Blossom Hotel in Houston's Medical Center Area, offering aesthetics, laser and recovery-focused

Vichy, Auvergne-Rhône-Alpes

Adults-only thermal baths in Vichy using the town's mineral spring water, with a hydrotherapy circuit and thermal pool, booking required.

Los Angeles, California

Japanese-style day spa in Beverly Hills offering massage and bodywork for solo visitors and couples by reservation.

Sedona, Arizona

A sensory-deprivation float spa in Sedona offering private oval float pods with Epsom salt water, open most afternoons with walk-ins and memberships available.

Los Angeles, California

Esthetician-run skincare studio in Del Rey offering facials, acne treatment and micro-infusion, with Japanese-language service available.

Seville, Andalusia

A reservation-only private spa suite with pool in Seville's Casco Antiguo, booked by the hour for couples.

Philadelphia, Pennsylvania

A second-floor day spa near Rittenhouse Square offering skincare, scalp analysis and its signature Aroma Chakra Balancing Therapy, with a membership discount

Atlanta, Georgia

A Buckhead day spa open daily until 10pm, with couples treatments and both walk-in and reservation options at moderate prices.

Carmichael, California

A single-room salt cave in a Carmichael strip mall offering 45-minute salt therapy sessions for relaxation and respiratory relief.

San Diego, California

Alice in Wonderland-themed day spa in Mid-City San Diego focused on facials, massage and skincare since 2014, open daily 10am-7pm.

Tucson, Arizona

Day spa near Swan Way Park in Tucson with a cedar hot tub, cold plunge, infrared sauna and massage, bookable by reservation for adults only.

Kyoto

Hotel spa on the 2nd floor of Dhawa Yura Kyoto in Higashiyama, offering private-suite treatments by Banyan Tree Academy-trained therapists.

Key West, Florida

A hotel spa at Pier House Resort in Key West for guests only, offering couples treatments for ages 14 and up with advance reservations.