Mineral Baths & Spa Rigi Kaltbad Swim at 1433 meters in the mineral-rich spring water of the Rigi. The Mineralbad & Spa Rigi Kaltbad, designed by architect Mario Botta, offers indoor and outdoor pools with views of Lake Lucerne and the Alps. Find out more about: + Mineral Baths & Spa Rigi Kaltbad