Spas with moderate

Santorini, South Aegean

Natural sulfur hot springs at the foot of a volcanic islet in the Santorini caldera, reached by boat and accessed by swimming from the water.

Abano Terme, Veneto

A day-pass thermal spa in Abano Terme with an outdoor thermal pool, set at the foot of the Euganean Hills in the Veneto countryside.

Warwick, Rhode Island

A boutique Hilton hotel in a converted Warwick textile mill offering guests a sauna and fitness center, with no public day-spa access.

Abano Terme, Veneto

A family-run thermal spa complex in Abano Terme with two hotels, thermal pools, mud therapy and a day-pass option for non-guests.

Calistoga, California

MoonAcre Spa & Baths is a day spa in Calistoga with a thermal pool, hot tub and sauna, open daily 9am–5pm and geared toward families and couples.

Orlando, Florida

Resort spa at a lakefront Orlando timeshare property near Universal, with sauna and steam room access included in treatments.

Yuseong, Daejeon

A Korean bathhouse in Yuseong, Daejeon, open daily from early morning to late night with steam room, sauna and lounge, walk-ins welcome.

Denver, Colorado

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

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

Denver, Colorado

Adults-only bathhouse on West Colfax Ave in Denver with a steam room, sauna, hot tub and relaxation lounge, open daily except Tuesday.

Ho Chi Minh City

A District 1 day spa and sauna open daily from 10am to 11:30pm, for adults only, with walk-in access.