Located in an ancient spa capital in south Tuscany’s Maremma region midway between Florence and Rome, this elegant 140-room resort is built around a 3,000-year-old thermal pool that sits above a crater of volcanic origin. The waters, enriched with large concentrations of dissolved mineral salts and gases, issue forth at a rate of 500 liters per second. The waters are consistently 104 degrees F., roughly the same temperature as amniotic fluid, and reputedly benefit the skin as well as the cardiovascular and respiratory systems. The spring feeds the resort’s extensive thermal park of four hot water swimming pools, waterfalls, and Jacuzzis. Gently rolling fairways on the resort’s Ron Fream-designed course, opened five years ago, are backdropped by medieval villages and Monte Amiata as well as olive groves and fields of sunflowers.