Spa salt room at Aria at CityCenter in Las Vegas. Treatment rooms are upstairs in such a big, mazelike space that I repeatedly got lost. I managed to find the two meditation rooms, and there I stayed. One is built of salt walls, even salt lamps, and contoured chairs vibrate to the sound of loud instrumental music - the effect was like a mini-massage. The other consists of a handful of flat, warmed stone "beds" and dim lighting.

I loved the feel of the warm, almost hot tile (put a towel down first) and found it to be an extremely relaxing experience.