Spas with adults only

Seattle, Washington

A Russian-style bathhouse in South Lake Union with a hydrotherapy circuit and sauna, open to walk-ins daily except Monday, adults only.

Portland, Oregon

A member-run bathhouse in Concordia with a clothing-optional salt-water hot pool, cedar sauna and courtyard, day passes from $18.

Chantilly, Virginia

King SPA is a Korean bathhouse in Chantilly, VA, with gender-separated clothing-optional baths, mixed saunas, a restaurant, and day passes for walk-ins.