Kaiser-Friedrich-Therme

Built in 1913 as a municipal bathhouse on the site of a Roman steam bath, the gorgeous Kaiser-Friedrich-Therme are fed by water naturally heated to 66.4°C. Ask for a sheet in English on 'bathing like the ancient Romans' by availing yourself of a succession of saunas and pools. Bathrobes and towels can be rented; swimsuits are unnecessary as, in keeping with Saunakultur, this place is 'textile-free'. Actually, bathing suits are completely forbidden only in the sauna (you just wear a towel); elsewhere, nudity is merely a recommendation. Tuesday is for women only. The minimum age is 16.