Spas with upscale

Las Vegas, Nevada

Hotel spa inside Caesars Palace in Las Vegas with a hydrotherapy circuit and relaxation lounge, open daily 9am–6pm for hotel guests.

Aachen, North Rhine-Westphalia

Adults-only day spa in Aachen with a hydrotherapy circuit and relaxation lounge, open daily 10am–9pm, upscale pricing.

Lake Tahoe, California

Adults-only hotel spa inside Harrah's Lake Tahoe in Stateline, open daily with weekday and weekend hours that differ.

Park City, Utah

Hotel spa at The St. Regis Deer Valley in Park City, open daily 10am–6pm, reservation required, upscale pricing.

Bangkok

Hotel spa at SO/ Bangkok on Sathorn Road offering facial, body and beauty treatments plus rooftop infinity pool and fitness access, hotel guests only.

Boston, Massachusetts

Hotel spa inside the InterContinental Boston in the Downtown waterfront district, open daily 10am–6pm, reservation required for guests.

Shibu Onsen, Nagano

A ryokan in Shibu Onsen with indoor and outdoor hot-spring baths fed by two blended mineral springs, open only to overnight guests.

Scottsdale, Arizona

A hotel spa at Scottsdale Camelback Resort, open only to resort guests staying in the property's villas at the base of Camelback Mountain.

Scottsdale, Arizona

An adults-only hotel spa in Old Town Scottsdale with sauna, steam room, cold plunge and thermal pools, open to hotel guests 21 and up.

Los Angeles, California

Medical spa in DTLA's Financial District offering injectables, lasers, microneedling, and body contouring by reservation.

Goa

A hotel spa inside Sea Queen Beach Resort on Colva Beach, Betalbatim, Goa, open to overnight guests with one signature treatment called The Sea View.

New York City, New York

An adults-only day spa on Mercer Street in Soho, open Thursday through Saturday by reservation only.

Lake Tahoe, California

A medical spa in South Lake Tahoe offering Botox, fillers, weight-loss injections, laser resurfacing and microneedling, by appointment only, adults only.

Tyrol, Bavaria

Hotel spa in Kreuth-Reitrain near Tegernsee with a 3,000 sqm onsen-style bathing area, hot and cold pools, saltwater pools and sauna, open on a day-pass basis.

The Hamptons, New York

Day spa on Montauk Highway in East Hampton offering facials, massage, nails and waxing, open daily 9am–6pm since 2003.

Bordeaux, Nouvelle-Aquitaine

Hotel spa at Palais Gallien in Bordeaux offering Nuxe skincare treatments built around the brand's signature Huile Prodigieuse, open daily by reservation.

Atlanta, Georgia

A hotel spa inside Signia Atlanta, limited to hotel guests, with couples-oriented treatments and hours that vary through the week.

Palm Beach, Florida

Upscale hotel spa in West Palm Beach for adults and couples, open daily 10am–6pm with reservations required.

Las Vegas, Nevada

Hotel spa and fitness center at The LINQ in Las Vegas with steam room and sauna, open daily 9am–5pm, day passes available.

Chicago, Illinois

Hotel spa on the fifth floor of theWit in downtown Chicago's Loop, open for day-pass massages most days of the week.

Houston, Texas

A hotel spa inside JW Marriott Houston Downtown, reserved for guests staying there and only accessible by reservation.

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.

Punta Cana, La Altagracia

Adults-only all-inclusive resort spa in Bávaro with a gym, sauna and couples treatment rooms, open to hotel guests aged 18 and up.