Spas with reservation required

Tampere, Pirkanmaa

A budget-friendly public sauna and bathhouse in Tampere, open to walk-ins but reservations are also an option.

Ixtapan de la Sal, State of Mexico

A moderately priced day spa in Ixtapan de la Sal open daily 9am–6pm, with walk-ins welcome but reservations required.

Sun Valley, Idaho

A family-owned medical spa in Ketchum, Idaho, offering skin and wellness treatments since 2008, with walk-ins welcome but reservations recommended.

Boston, Massachusetts

A downtown Boston day spa at 1 Devonshire Pl offering massage and wellness treatments for solo visitors and couples.

Bad Blumau, Styria

Rogner Bad Blumau is a Hundertwasser-designed thermal resort in Styria with geothermal pools, outdoor baths and hotel-guest-only access.

Medellín, Antioquia

A couples-focused day spa in El Poblado, Medellín, open daily 9am to 7pm with moderate pricing.

Kansas City, Missouri

A hotel spa inside the Westin Kansas City at Crown Center, open to hotel guests by reservation in downtown Kansas City.

Yufuin, Oita

A small hillside ryokan near Yufuin's town center where every room has its own half-open-air bath filled with 100% source hot-spring water and a view of Mt.

Tulum, Quintana Roo

Beachfront resort in Tulum pairing overnight stays with spa treatments, yoga and fitness classes, open to hotel guests only.

Ojai, California

A day spa on Mariano Drive in Ojai open evenings on weekdays and daytime on weekends, for solo visitors or couples.

Bodrum, Muğla

A hammam in Gümbet, Bodrum, open daily 10am-7pm for adults and couples, with both walk-in access and a reservation requirement, moderate pricing.

Houston, Texas

A women-owned day spa in South Central Houston offering massages, facials and laser treatments alongside a sauna and oxygen lounge.

Denver, Colorado

Private Russian banya spa in Denver's Cheesman Park offering banya sessions, massage and body treatments by appointment since 1995.

San Diego, California

East Village day spa specializing in Thai massage, with scrubs, hot stone and coconut soak add-ons, open daily with walk-ins accepted.

New York City, New York

Bowery massage and foot reflexology spot in Manhattan open daily 10am to midnight, walk-ins welcome, since 2012.

Boston, Massachusetts

Season Four Spa is a small Back Bay day spa offering Swedish, deep tissue and hot stone bodywork plus foot reflexology, open daily 9am-9pm with walk-ins

Big Sur, California

Adults-only hotel spa at Ventana Big Sur with ocean-view treatment rooms, outdoor cabanas for couples, and a 24-hour fitness and yoga space.

Charleston, South Carolina

A full-service day spa on Charleston's King Street offering massage, facials, hair, nails and makeup by reservation only.

Philadelphia, Pennsylvania

A private-reservation spa in Philadelphia's Manayunk neighborhood for date nights, birthday and bachelorette parties, with hot tub, sauna and massage chairs

San Diego, California

A budget massage studio in San Diego's City Heights area, open daily from 9am to 11pm for walk-in or booked sessions.

Hot Springs, Arkansas

A moderately priced day spa in Hot Springs Village, Arkansas, open weekdays for adults and couples, with reservations recommended.

Chicago, Illinois

A hotel spa for Waldorf Astoria guests only in Chicago's Rush & Division area, open daily 6am-9pm by reservation, luxury pricing.

Tel Aviv, Tel Aviv District

A hotel spa inside The George in Tel Aviv offering massages and body treatments for solo guests and couples, open daily 9am-5pm by reservation.

Orlando, Florida

Affordable day spa on Orlando's International Drive offering Thai massage, facials, reflexology, and couples treatments alongside a steam room and sauna.