Spas with relaxation lounge

Boston, Massachusetts

A hotel spa inside Mandarin Oriental, Boston's Back Bay property, open to hotel guests only, with sauna, steam room, pools and a cold plunge.

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.

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