"Modeled after Japanese onsen culture, this hilltop spa offers private bathing suites with hot tubs, saunas, changing rooms, and showers on a 20‑acre property; the smallest suites accommodate up to four people, while the Grand Bath can host up to 18. Overnight lodging is intimate and limited (about 13 rooms), reservations for private hot tub suites are coveted, and water temperatures are maintained around 105°F with cold plunges near 55°F, creating a full-service wellness escape centered on thermal bathing." - Annie Archer Annie Archer Annie Archer is the assistant social media editor at Travel + Leisure. She loves road trips, national parks, beach destinations, remote Airbnbs, and all things Italy. Travel + Leisure Editorial Guidelines