Spas with luxury

Penang

An adults-only villa resort spa near Kepala Batas, Penang, with 18 private villas, spa treatments and plant-based dining; reservation required.

Bartlett, Tennessee

An appointment-only luxury day spa in Bartlett Station, Memphis, with service packages priced up to several thousand dollars.

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.

Chicago, Illinois

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