Das Badhaus is the day spa in the Radisson Blu Schwarzer Bock hotel by the Kochbrunnen spring, under historic vaulted ceilings. Its spa area has a Finnish sauna, a steam bath, a warm bench and a 5 x 8 m pool of Kochbrunnen thermal water at about 30°C, open to non-residents from €15 an hour or €27 for three hours, from age 16. Groups of up to 15 can book the whole spa privately for three hours, and treatments include baths in the spring water. Open daily 10:00 to 18:00.