Vaporarium, a treasure of the Luchon spa, is a natural steam bath unique in Europe. 150 m of fitted underground galleries. Spa water filtered through the rock wall. Pleasant, humid heat from 38° to 42°C. The Vaporarium is contained in a large glass building constructed in 1970, then enlarged and totally renovated in 1993. It is dedicated to rheumatology treatment, but also contains treatment booths, rehabilitation and relaxation swimming pools, and the treatment galleries of the radiovaporarium.