Luxembourg's indoor pools The Grand Duchy boasts a multitude of indoor swimming centres offering much more than just the opportunity to in more Massage Luxembourg plus your laps sarita rao For children under four, it is free. Emerge from each massage completely relaxed and rejuvenated. Editor's Picks. There's also a double Finnish sauna with light therapy, a Turkish bath and solariums. Les Thermes also offers wellness facilities including six saunas, two steam baths and a solarium, plus beauty and massage treatments. Nicolas Anen An open-air pool that can be covered in just seven minutes, the main pool is sqm.