The Wellness Floor at One Dalton
Hotel SpaBoston, Massachusetts
Hotel spa inside the Four Seasons One Dalton in Back Bay, with six treatments, a couples' suite and a 64-foot lap pool, open to hotel guests.
$$$$
Spas with pool in Massachusetts
3 spas
Breve Spa
Hotel SpaBoston, Massachusetts
Hotel spa inside the Omni Boston Hotel at the Seaport, with eight treatment rooms and a rooftop pool, open to hotel guests only.
$$$Prospect Berkshires
Resort SpaBerkshires, Massachusetts
A lakeside resort in Egremont with a seasonal pool and sauna for overnight guests only; no day passes and no spa treatments on offer.
$$$