Tegernsee

At Lanserhof, guests embark on an intensely challenging, doctor-guided protocol for cleansing the digestive system. It goes like this: You fast, drinking only tea and water. Then you detox, drinking Epsom salts to purge the system. And then you eat—at first, according to a radically restricted diet—and learn to chew properly. (Thirty to forty times for each small bite.) That said, the central activity at Lanserhof is relaxation. The spa offers a vast menu of treatments, some traditional (like fruit acid facials and Dead Sea salt soaks), others cutting-edge (like electromagnetic sculpting). And if the pampering were not enough to distract you from your detox, the mesmerizing location might be. There are three other Lanserhof locations: Lans, the original location outside Innsbruck; Sylt, on a German island off Denmark’s western coast; and Lanserhof at the Arts Club, in London.