In the Tuscan village of Bagno Vignoni, the healing thermal waters of Hotel Adler Thermae are a hot draw for Europe’s spa insiders. Celebrating the age-old tradition of steam bathing, mineral soaks and thermal waters, the spa’s centerpiece mineral pool flows from indoors to out, with views of the Tuscan countryside. Lounge beneath the Italian sky, or dive in to reap the benefits of the pool’s self-massage features, which include a central, rock-themed waterfall that offers an invigorating self-massage experience.

Indulge in a daily round of themed herbal steams, or book a consultation with Adler’s on-staff medical team for a personalized water cure or fitness assessment. A cave in one corner of the property has been converted to a dreamy grotto, and you can follow up your steam with a nap beneath the stalactites while listening to the soothing music of the cave’s floor-to-ceiling waterfall. A full menu of massages is available, and unique therapies include couple’s bathing sessions in a private seawater grotto.

Elegant guestrooms with clean lines feature outdoor patios, while breakfast and dinner are taken in the glass-ceiling dining room, rolled back to the open sky when the weather is fine. Enjoy the afternoon tea buffet, and sample a sumptuous Tuscan pastry while gazing at the ruins of a nearby castle.

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