From Krakow: Bukovina Thermal Baths

In the Bukovina Thermal Baths there are many indoor and outdoor pools. There are also 8 saunas for relaxation (which include traditional saunas, steam baths, and infrared cabins) and waterslides for some fun. The mineral-rich water is extracted from 2400 meters below the Earth's surface and regulated to temperatures of 30 to 38 degrees Celsius.